diff --git a/src/controllers/GroupsController.ts b/src/controllers/GroupsController.ts
index a7c2b75..4f9b93e 100644
--- a/src/controllers/GroupsController.ts
+++ b/src/controllers/GroupsController.ts
@@ -140,7 +140,7 @@ export class GroupsController {
 	 */
 	private static async GroupInfoToAPI(info: GroupInfo, h: RequestHandler, advanced: boolean = false) : Promise<any> {
 		
-		const membership = await GroupsHelper.GetMembershipInfo(info.id, h.getUserId())
+		const membership = await GroupsHelper.GetMembershipInfo(info.id, h.optionnalUserID)
 		
 		const data = {
 			id: info.id,
diff --git a/src/controllers/Routes.ts b/src/controllers/Routes.ts
index 5ccc318..61174a2 100644
--- a/src/controllers/Routes.ts
+++ b/src/controllers/Routes.ts
@@ -93,5 +93,5 @@ export const Routes : Route[] = [
 
 	{path: "/groups/get_multiple_info", cb: (h) => GroupsController.GetInfoMultiple(h)},
 
-	{path: "/groups/get_advanced_info", cb: (h) => GroupsController.GetAdvancedInfo(h)},
+	{path: "/groups/get_advanced_info", cb: (h) => GroupsController.GetAdvancedInfo(h), needLogin: false},
 ]
\ No newline at end of file
diff --git a/src/entities/RequestHandler.ts b/src/entities/RequestHandler.ts
index 8baf22b..fd89973 100644
--- a/src/entities/RequestHandler.ts
+++ b/src/entities/RequestHandler.ts
@@ -222,7 +222,7 @@ export class RequestHandler {
 	public async postGroupIDWithAccess(name: string, minVisibility : GroupsAccessLevel) : Promise<number> {
 		const groupID = await this.postGroupID(name);
 
-		const access = await GroupsHelper.GetAccessLevel(groupID, this.getUserId());
+		const access = await GroupsHelper.GetAccessLevel(groupID, this.optionnalUserID);
 
 		if(access == GroupsAccessLevel.NO_ACCESS)
 			this.error(404, "Specified group not found!");
@@ -369,6 +369,14 @@ export class RequestHandler {
 		return this.userID;
 	}
 
+	/**
+	 * Get the ID of the current user (if any)
+	 * or 0 if the user is not signed in
+	 */
+	public get optionnalUserID(): number {
+		return this.userID >= 1 ? this.userID : 0;
+	}
+
 	/**
 	 * Check out whether user is signed in or not
 	 */
diff --git a/src/helpers/GroupsHelper.ts b/src/helpers/GroupsHelper.ts
index 0368dd1..92919dc 100644
--- a/src/helpers/GroupsHelper.ts
+++ b/src/helpers/GroupsHelper.ts
@@ -204,6 +204,10 @@ export class GroupsHelper {
 	 * @returns Membership info / null if none found
 	 */
 	public static async GetMembershipInfo(groupID: number, userID: number): Promise<GroupMember> {
+
+		if(userID == 0)
+			return null;
+
 		const data = await DatabaseHelper.QueryRow({
 			table: GROUPS_MEMBERS_TABLE,
 			where: {