diff --git a/lib/models/post.dart b/lib/models/post.dart
index fc7cfe8..19dde81 100644
--- a/lib/models/post.dart
+++ b/lib/models/post.dart
@@ -58,22 +58,13 @@ class Post implements LikeElement {
       required this.access,
       required this.comments,
       required this.survey})
-      : assert(id != null),
-        assert(userID != null),
-        assert(userPageID != 0 || groupID != 0),
-        assert(timeSent != null),
-        assert(kind != PostKind.TEXT || content != null),
-        assert(visibilityLevel != null),
-        assert(kind != null),
+      : assert(userPageID != 0 || groupID != 0),
         assert(kind != PostKind.COUNTDOWN || timeEnd != null),
-        assert(kind != PostKind.SURVEY || survey != null),
-        assert(likes != null),
-        assert(userLike != null),
-        assert(access != null);
+        assert(kind != PostKind.SURVEY || survey != null);
 
   bool get isGroupPost => groupID != null && groupID! > 0;
 
-  bool get hasContent => content != null && !content.isNull;
+  bool get hasContent => !content.isNull && !content.isEmpty;
 
   bool get hasComments => comments != null;
 
diff --git a/lib/models/res_check_password_reset_token.dart b/lib/models/res_check_password_reset_token.dart
index aa57b2d..cb67fd5 100644
--- a/lib/models/res_check_password_reset_token.dart
+++ b/lib/models/res_check_password_reset_token.dart
@@ -1,5 +1,3 @@
-
-
 /// Check password reset token result
 ///
 /// @author Pierre Hubert
@@ -13,7 +11,5 @@ class ResCheckPasswordToken {
     required this.firstName,
     required this.lastName,
     required this.email,
-  })  : assert(firstName != null),
-        assert(lastName != null),
-        assert(email != null);
+  });
 }
diff --git a/lib/models/search_result.dart b/lib/models/search_result.dart
index 54db2fa..4bff880 100644
--- a/lib/models/search_result.dart
+++ b/lib/models/search_result.dart
@@ -1,5 +1,3 @@
-
-
 /// Single search result
 ///
 /// @author Pierre Hubert
@@ -13,6 +11,5 @@ class SearchResult {
   SearchResult({
     required this.id,
     required this.kind,
-  })  : assert(id != null),
-        assert(kind != null);
+  });
 }
diff --git a/lib/models/security_settings.dart b/lib/models/security_settings.dart
index dfe9599..5684755 100644
--- a/lib/models/security_settings.dart
+++ b/lib/models/security_settings.dart
@@ -1,5 +1,3 @@
-
-
 /// Security settings of the user
 ///
 /// @author Pierre HUBERT
@@ -15,8 +13,5 @@ class SecuritySettings {
     required this.securityAnswer1,
     required this.securityQuestion2,
     required this.securityAnswer2,
-  })  : assert(securityQuestion1 != null),
-        assert(securityAnswer1 != null),
-        assert(securityQuestion2 != null),
-        assert(securityAnswer2 != null);
+  });
 }
diff --git a/lib/models/server_config.dart b/lib/models/server_config.dart
index c3128ba..3cc1445 100644
--- a/lib/models/server_config.dart
+++ b/lib/models/server_config.dart
@@ -35,14 +35,7 @@ class PasswordPolicy {
     required this.minNumberDigits,
     required this.minNumberSpecialCharacters,
     required this.minCategoriesPresence,
-  })  : assert(allowMailInPassword != null),
-        assert(allowNameInPassword != null),
-        assert(minPasswordLength != null),
-        assert(minNumberUpperCaseLetters != null),
-        assert(minNumberLowerCaseLetters != null),
-        assert(minNumberDigits != null),
-        assert(minNumberSpecialCharacters != null),
-        assert(minCategoriesPresence != null);
+  });
 }
 
 class ServerDataConservationPolicy {
@@ -60,12 +53,7 @@ class ServerDataConservationPolicy {
     required this.minPostsLifetime,
     required this.minConversationMessagesLifetime,
     required this.minLikesLifetime,
-  })  : assert(minInactiveAccountLifetime != null),
-        assert(minNotificationLifetime != null),
-        assert(minCommentsLifetime != null),
-        assert(minPostsLifetime != null),
-        assert(minConversationMessagesLifetime != null),
-        assert(minLikesLifetime != null);
+  });
 }
 
 class ConversationsPolicy {
@@ -97,19 +85,7 @@ class ConversationsPolicy {
     required this.maxThumbnailHeight,
     required this.maxLogoWidth,
     required this.maxLogoHeight,
-  })  : assert(maxConversationNameLen != null),
-        assert(minMessageLen != null),
-        assert(maxMessageLen != null),
-        assert(allowedFilesType != null),
-        assert(filesMaxSize != null),
-        assert(writingEventInterval != null),
-        assert(writingEventLifetime != null),
-        assert(maxMessageImageWidth != null),
-        assert(maxMessageImageHeight != null),
-        assert(maxThumbnailWidth != null),
-        assert(maxThumbnailHeight != null),
-        assert(maxLogoWidth != null),
-        assert(maxLogoHeight != null);
+  });
 }
 
 class AccountInformationPolicy {
@@ -125,11 +101,7 @@ class AccountInformationPolicy {
     required this.minLastNameLength,
     required this.maxLastNameLength,
     required this.maxLocationLength,
-  })  : assert(minFirstNameLength != null),
-        assert(maxFirstNameLength != null),
-        assert(minLastNameLength != null),
-        assert(maxLastNameLength != null),
-        assert(maxLocationLength != null);
+  });
 }
 
 enum BannerNature { Information, Warning, Success }
@@ -161,9 +133,7 @@ class Banner {
     required this.nature,
     required this.message,
     required this.link,
-  })  : assert(enabled != null),
-        assert(nature != null),
-        assert(message != null);
+  });
 
   bool get visible => enabled && (expire == null || expire! > time());
 }
@@ -195,15 +165,5 @@ class ServerConfig {
     required this.dataConservationPolicy,
     required this.conversationsPolicy,
     required this.accountInformationPolicy,
-  })  : assert(minSupportedMobileVersion != null),
-        assert(termsURL != null),
-        assert(privacyPolicyURL != null),
-        assert(contactEmail != null),
-        assert(playStoreURL != null),
-        assert(androidDirectDownloadURL != null),
-        assert(notificationsPolicy != null),
-        assert(passwordPolicy != null),
-        assert(dataConservationPolicy != null),
-        assert(conversationsPolicy != null),
-        assert(accountInformationPolicy != null);
+  });
 }
diff --git a/lib/models/survey_choice.dart b/lib/models/survey_choice.dart
index aad40e5..4a6bcfe 100644
--- a/lib/models/survey_choice.dart
+++ b/lib/models/survey_choice.dart
@@ -1,5 +1,3 @@
-
-
 /// Single survey choice
 ///
 /// @author Pierre HUBERT
@@ -13,7 +11,5 @@ class SurveyChoice {
     required this.id,
     required this.name,
     required this.responses,
-  })  : assert(id != null),
-        assert(name != null),
-        assert(responses != null);
+  });
 }
diff --git a/lib/models/unread_conversation.dart b/lib/models/unread_conversation.dart
index ccea0ff..c680688 100644
--- a/lib/models/unread_conversation.dart
+++ b/lib/models/unread_conversation.dart
@@ -12,6 +12,5 @@ class UnreadConversation {
   const UnreadConversation({
     required this.conv,
     required this.message,
-  })  : assert(conv != null),
-        assert(message != null);
+  });
 }
diff --git a/lib/models/ws_message.dart b/lib/models/ws_message.dart
index 3cf4d96..81e19eb 100644
--- a/lib/models/ws_message.dart
+++ b/lib/models/ws_message.dart
@@ -13,9 +13,7 @@ class WsMessage {
     required this.id,
     required this.title,
     required this.data,
-  })  : assert(id != null),
-        assert(title != null),
-        assert(title.length > 0);
+  }) : assert(title.length > 0);
 
   /// Construct a message from a JSON document (messages coming from the server)
   static WsMessage fromJSON(final Map<dynamic, dynamic> m) {
@@ -23,12 +21,11 @@ class WsMessage {
   }
 
   /// Turn a message into a JSON object to send it to the API
-  String toJSON() =>
-      jsonEncode({
+  String toJSON() => jsonEncode({
         "id": id,
         "title": title,
         "data": data,
       });
 
-  bool get hasId => this.id != null && this.id.isNotEmpty;
+  bool get hasId => this.id.isNotEmpty;
 }
diff --git a/lib/ui/dialogs/alert_dialog.dart b/lib/ui/dialogs/alert_dialog.dart
index 6bca726..5d127fa 100644
--- a/lib/ui/dialogs/alert_dialog.dart
+++ b/lib/ui/dialogs/alert_dialog.dart
@@ -11,9 +11,7 @@ Future<void> alert(BuildContext context, String? msg) async {
 class _AlertDialog extends StatelessWidget {
   final String msg;
 
-  const _AlertDialog({Key? key, required this.msg})
-      : assert(msg != null),
-        super(key: key);
+  const _AlertDialog({Key? key, required this.msg}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
diff --git a/lib/ui/dialogs/audio_player_dialog.dart b/lib/ui/dialogs/audio_player_dialog.dart
index 972f759..f5e9a05 100644
--- a/lib/ui/dialogs/audio_player_dialog.dart
+++ b/lib/ui/dialogs/audio_player_dialog.dart
@@ -19,8 +19,7 @@ class _AudioPlayerDialog extends StatefulWidget {
   const _AudioPlayerDialog({
     Key? key,
     required this.url,
-  })  : assert(url != null),
-        super(key: key);
+  })  : super(key: key);
 
   @override
   __AudioPlayerDialogState createState() => __AudioPlayerDialogState();
diff --git a/lib/ui/dialogs/input_new_password_dialog.dart b/lib/ui/dialogs/input_new_password_dialog.dart
index 28cd45f..b5fb4e0 100644
--- a/lib/ui/dialogs/input_new_password_dialog.dart
+++ b/lib/ui/dialogs/input_new_password_dialog.dart
@@ -12,8 +12,6 @@ Future<String?> showInputNewPassword({
   required BuildContext context,
   required UserInfoForPassword userInfo,
 }) async {
-  assert(context != null);
-  assert(userInfo != null);
   return await showDialog(
       context: context,
       builder: (c) => _InputNewPasswordDialog(
@@ -27,8 +25,7 @@ class _InputNewPasswordDialog extends StatefulWidget {
   const _InputNewPasswordDialog({
     Key? key,
     required this.userInfo,
-  })  : assert(userInfo != null),
-        super(key: key);
+  })  : super(key: key);
 
   @override
   __InputNewPasswordDialogState createState() =>
@@ -45,7 +42,8 @@ class __InputNewPasswordDialogState extends State<_InputNewPasswordDialog> {
   bool get _input1Valid =>
       _controller1.currentState != null && _controller1.currentState!.valid;
 
-  bool get _input2Valid => _controller1.currentState!.value == _controller2.text;
+  bool get _input2Valid =>
+      _controller1.currentState!.value == _controller2.text;
 
   bool get _isValid => _input1Valid && _input2Valid;
 
diff --git a/lib/ui/dialogs/multi_choices_dialog.dart b/lib/ui/dialogs/multi_choices_dialog.dart
index a19591d..7088ba7 100644
--- a/lib/ui/dialogs/multi_choices_dialog.dart
+++ b/lib/ui/dialogs/multi_choices_dialog.dart
@@ -51,9 +51,7 @@ class _MultiChoicesEntryDialog<T> extends StatefulWidget {
     required this.title,
     required this.defaultChoice,
     required this.choices,
-  })  : assert(title != null),
-        assert(defaultChoice != null),
-        assert(choices != null),
+  })  : assert(defaultChoice != null),
         super(key: key);
 
   @override
diff --git a/lib/ui/dialogs/pick_file_dialog.dart b/lib/ui/dialogs/pick_file_dialog.dart
index 693fe4c..91774d0 100644
--- a/lib/ui/dialogs/pick_file_dialog.dart
+++ b/lib/ui/dialogs/pick_file_dialog.dart
@@ -39,10 +39,7 @@ class _PickFileOption {
     required this.label,
     required this.icon,
     required this.canEnable,
-  })  : assert(value != null),
-        assert(label != null),
-        assert(icon != null),
-        assert(canEnable != null);
+  });
 }
 
 List<_PickFileOption> get _optionsList => [
@@ -94,8 +91,6 @@ Future<BytesFile?> showPickFileDialog({
   int? imageMaxHeight,
   CropAspectRatio? aspectRatio,
 }) async {
-  assert(allowedMimeTypes != null);
-
   // Get the list of allowed extension
   final allowedExtensions = <String>[];
   for (var mime in allowedExtensions) {
@@ -196,9 +191,7 @@ class _BottomSheetPickOption extends StatelessWidget {
 
   const _BottomSheetPickOption(
       {Key? key, required this.options, required this.onOptionSelected})
-      : assert(options != null),
-        assert(onOptionSelected != null),
-        super(key: key);
+      : super(key: key);
 
   @override
   Widget build(BuildContext context) => Container(
diff --git a/lib/ui/dialogs/record_audio_dialog.dart b/lib/ui/dialogs/record_audio_dialog.dart
index bfeb728..eca94c0 100644
--- a/lib/ui/dialogs/record_audio_dialog.dart
+++ b/lib/ui/dialogs/record_audio_dialog.dart
@@ -266,9 +266,7 @@ class _RecordAction extends StatelessWidget {
     required this.icon,
     required this.onTap,
     this.color,
-  })  : assert(visible != null),
-        assert(icon != null),
-        super(key: key);
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -287,9 +285,7 @@ class _ActionButton extends StatelessWidget {
     required this.visible,
     required this.text,
     this.onPressed,
-  })  : assert(visible != null),
-        assert(text != null),
-        super(key: key);
+  })  : super(key: key);
 
   @override
   Widget build(BuildContext context) {
diff --git a/lib/ui/dialogs/single_input_dialog.dart b/lib/ui/dialogs/single_input_dialog.dart
index eb4378f..5405a9f 100644
--- a/lib/ui/dialogs/single_input_dialog.dart
+++ b/lib/ui/dialogs/single_input_dialog.dart
@@ -27,12 +27,7 @@ class SingleInputDialog extends StatefulWidget {
     this.canBeEmpty = false,
     this.maxLines = 1,
     this.maxLength,
-  })  : assert(title != null),
-        assert(label != null),
-        assert(checkInput != null),
-        assert(errorMessage != null),
-        assert(maxLines != null),
-        super(key: key);
+  }) : super(key: key);
 
   @override
   __InputURLDialogState createState() => __InputURLDialogState();
diff --git a/lib/ui/dialogs/virtual_directory_dialog.dart b/lib/ui/dialogs/virtual_directory_dialog.dart
index 244bfaf..57dedd5 100644
--- a/lib/ui/dialogs/virtual_directory_dialog.dart
+++ b/lib/ui/dialogs/virtual_directory_dialog.dart
@@ -18,11 +18,6 @@ Future<String?> showVirtualDirectoryDialog({
   required int id,
   required VirtualDirectoryTargetType type,
 }) async {
-  assert(context != null);
-  assert(initialDirectory != null);
-  assert(id != null);
-  assert(type != null);
-
   return await showDialog<String>(
       context: context,
       builder: (c) => _VirtualDirectoryPicker(
@@ -39,10 +34,7 @@ class _VirtualDirectoryPicker extends StatefulWidget {
     required this.initialDirectory,
     required this.id,
     required this.type,
-  })  : assert(initialDirectory != null),
-        assert(id != null),
-        assert(type != null),
-        super(key: key);
+  }) : super(key: key);
 
   @override
   __VirtualDirectoryPickerState createState() =>
diff --git a/lib/ui/routes/forgot_password_route.dart b/lib/ui/routes/forgot_password_route.dart
index 579751a..203962e 100644
--- a/lib/ui/routes/forgot_password_route.dart
+++ b/lib/ui/routes/forgot_password_route.dart
@@ -246,9 +246,7 @@ class _ResetPasswordBodyState extends SafeState<_ResetPasswordBody> {
 class _Spacer extends StatelessWidget {
   final bool visible;
 
-  const _Spacer({Key? key, this.visible = true})
-      : assert(visible != null),
-        super(key: key);
+  const _Spacer({Key? key, this.visible = true}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
diff --git a/lib/ui/routes/main_route/main_route.dart b/lib/ui/routes/main_route/main_route.dart
index 03348c7..316611c 100644
--- a/lib/ui/routes/main_route/main_route.dart
+++ b/lib/ui/routes/main_route/main_route.dart
@@ -50,8 +50,9 @@ abstract class MainController extends State<MainRoute> {
   int get numberOfPages => _pagesStack.length;
 
   /// Get current instance of Home controller
+  ///
+  /// A future implementation might need context again, that is why it is required
   static MainController? of(BuildContext context) {
-    assert(context != null); // A future implementation might need context again
     return mainControllerKey.currentState;
   }
 
diff --git a/lib/ui/routes/push_notifications_route.dart b/lib/ui/routes/push_notifications_route.dart
index 89c988c..ce75d7d 100644
--- a/lib/ui/routes/push_notifications_route.dart
+++ b/lib/ui/routes/push_notifications_route.dart
@@ -126,7 +126,7 @@ class PushNotificationsConfigurationWidgetState
               available: srvConfig!.notificationsPolicy.hasFirebase,
               onChanged: (s) {
                 setState(() => currStatus = s);
-                if (widget.onChanged != null) widget.onChanged();
+                widget.onChanged();
               },
             ),
             SizedBox(height: 5),
diff --git a/lib/ui/routes/settings/custom_emojies_account_settings.dart b/lib/ui/routes/settings/custom_emojies_account_settings.dart
index 837e4f4..e90d25f 100644
--- a/lib/ui/routes/settings/custom_emojies_account_settings.dart
+++ b/lib/ui/routes/settings/custom_emojies_account_settings.dart
@@ -129,8 +129,7 @@ class _NewCustomEmojiDialog extends StatefulWidget {
   const _NewCustomEmojiDialog({
     Key? key,
     required this.currentList,
-  })  : assert(currentList != null),
-        super(key: key);
+  }) : super(key: key);
 
   @override
   _NewCustomEmojiDialogState createState() => _NewCustomEmojiDialogState();
diff --git a/lib/ui/screens/group_settings_screen.dart b/lib/ui/screens/group_settings_screen.dart
index 70149f8..1840f09 100644
--- a/lib/ui/screens/group_settings_screen.dart
+++ b/lib/ui/screens/group_settings_screen.dart
@@ -35,8 +35,7 @@ class GroupSettingsScreen extends StatefulWidget {
   final int groupID;
 
   const GroupSettingsScreen({Key? key, required this.groupID})
-      : assert(groupID != null),
-        super(key: key);
+      : super(key: key);
 
   @override
   _GroupSettingsScreenState createState() => _GroupSettingsScreenState();
diff --git a/lib/ui/tiles/menu_tile.dart b/lib/ui/tiles/menu_tile.dart
index 4ff48ba..0c8eaa6 100644
--- a/lib/ui/tiles/menu_tile.dart
+++ b/lib/ui/tiles/menu_tile.dart
@@ -8,7 +8,7 @@ class MenuTile extends StatelessWidget {
   final String title;
   final GestureTapCallback? onTap;
 
-  const MenuTile({required this.title, this.onTap}) : assert(title != null);
+  const MenuTile({required this.title, this.onTap});
 
   @override
   Widget build(BuildContext context) {