website front page error

Hi, I’m getting this error on site, since 24.06.14 Probably after update?

“Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 85 bytes) in /home/sample/public_html/wp-includes/meta.php on line 778”

The error afects only the front page of the site, where is located a widget with the latest ads. No matter if the widget is deleted, the error still occures.

The page with the ads (not the frontpage) is working.

I also checked the memory allocated, is ok. Only if this plugin is active i got the error mentioned above.

I had to deactivate the plugin for the frontpage to work.

Please review the situation