Fatal error: Uncaught Error: Attempt to modify property "user_id" on null in /customers/8/2/a/zahnarztrechnung.info/httpd.www/models/uc_funcs.php:379
Stack trace:
#0 /customers/8/2/a/zahnarztrechnung.info/httpd.www/uc_login.php(7): isUserLoggedIn()
#1 {main}
  thrown in /customers/8/2/a/zahnarztrechnung.info/httpd.www/models/uc_funcs.php on line 379