WebGUI login error

[pandafy]

I get a message on command line that the user authentication is successful, but the WebGUI errors out with following message

Parse error: syntax error, unexpected '$my_redirurl' (T_VARIABLE), expecting identifier (T_STRING) in /etc/inc/captiveportal.inc on line 327

It is similar to https://forum.netgate.com/topic/166662/sg1100-can-t-login-webgui-sometimes-after-21-05-1-upgrade/1, but the error is shown for different file.

I am using 2.5.2-RELEASE version.