Error When Merging Posts
 

I am getting this error when trying to merge two posts:

Fatal error: Call to undefined function: stripos() in /nfs/c03/h02/mnt/52289/domains/mysite.com/html/forums/includes/class_dm_threadpost.php(1730) : eval()'d code on line 2

This error appears to have come out of the blue because I have never had any problems in the past.

After I attempt to merge two posts, it actually does merge the posts to the destination thread correctly. However, the second post still remains, but all of it's content is removed.

So since it does merge correctly, I can simply delete the second post, but I am not a big fan of having this error.

Any ideas?