Notice: Undefined property: stdClass::$uid

I'm not sure if this is ctools problem but I'm having errors after installing ctools dev version:

Notice: Undefined property: stdClass::$uid function ctools_context_create_user()
public_html/sites/all/modules/ctools/plugins/contexts/user.inc

I can't see the proper error message because I just get empty white page in the error logs but after opening ".bin" file in watchdog mysql table I'm able to read some of it off of that:
--
a:6:{s:5:"%type";s:6:"Notice";s:8:"!message";s:34:"Undefined property: stdClass::$uid";s:9:"%function";s:28:"ctools_context_create_user()";s:5:"%file";s:76:"/public_html/sites/all/modules/ctools/plugins/contexts/user.inc";s:5:"%line";i:61;s:14:"severity_level";i:5;}
--

And I'm not sure why but it shows up randomly, I know it because if I'm looking the time when this log was generated and looking what page was generated in that time in "admin/reports/hits" then there are no matches.

It also registers for anonymous (not verified) user only.

Is it Ctools problem or can it be some otehr module causing it? Any help I'd highly appreciate