fix

backend/apps/web/routers/auths.py

@@ -120,20 +120,22 @@ async def signin(request: Request, form_data: SigninForm):
         user = Auths.authenticate_user_by_trusted_header(trusted_email)
     else:
         if WEBUI_AUTH == False:
-            if Users.get_num_users() != 0:
-                raise HTTPException(400, detail=ERROR_MESSAGES.EXISTING_USERS)
 
             admin_email = "admin@localhost"
             admin_password = "admin"
 
-            if not Users.get_user_by_email(admin_email.lower()):
+            if Users.get_user_by_email(admin_email.lower()):
+                user = Auths.authenticate_user(admin_email.lower(), admin_password)
+            else:
+                if Users.get_num_users() != 0:
+                    raise HTTPException(400, detail=ERROR_MESSAGES.EXISTING_USERS)
+
                 await signup(
                     request,
                     SignupForm(email=admin_email, password=admin_password, name="User"),
                 )
 
                 user = Auths.authenticate_user(admin_email.lower(), admin_password)
-
         else:
             user = Auths.authenticate_user(form_data.email.lower(), form_data.password)