Summary:Extension talk:OpenID/Call to a member function getAssociation() on a non-object in ...Consumer.php on line 945
Solved. This issue was caused by openbase_dir. You assume that you can write to /tmp, in today's hosting market this is no always the case. I suggest in the future you use sys_get_temp_dir. The easy work around is to set $wgOpenIDServerStorePath and $wgOpenIDConsumerStorePath to a dir that you do have write perms to.