--- Login.php.dpkg-dist	2018-05-14 23:22:24.000000000 +0200
+++ Login.php	2020-08-08 11:06:57.006418059 +0200
@@ -71,7 +71,7 @@
             throw new Horde_Auth_Exception('', Horde_Auth::REASON_BADLOGIN);
         }
 
-        $proc = @popen($this->_location . ' -c /bin/true ' . $userId, 'w');
+        $proc = @popen($this->_params['location'] . ' -c /bin/true ' . $userId, 'w');
         if (!is_resource($proc)) {
             throw new Horde_Auth_Exception('', Horde_Auth::REASON_FAILED);
         }