[Error Message] Forum White Screen after password protecting

[sandman1976]

Hey all,

When i create a password for a specific forum i am getting a white screen fatal error across the entire board. 

Fatal error: Call to undefined function my_hash_equals() in /var/sites/i/inc/functions_forumlist.php on line 145

Any ideas off the top of anyone's head?
Thanks
Ade.

[Ashley1]

if you upgraded to .18 then see this

https://community.mybb.com/thread-219388.html

If you have this problem on .18, you can try to upgrade to .19, i believe it's fixed in that version.

[sandman1976]

Thank You, I will try the upgrades this evening.