Warning: in_array on line 51

When activating the plugin I get the following error displayed by every article:

Warning: in_array() expects parameter 2 to be array, null given in ../k2/autometak2/autometak2.php on line 51

I'm using Joomla 3.0

Until I fix this issue, you can set the error reporting level to System Default or None to hide this warning.

Thank you, I have deactivated it.

Have you found any solution?

I follow the above but the title of each page takes the tag item and if there is no tag it takes the general keywords of the site.How can be set to have the k2 item title as the keywords?

Please post another request for this feature with more details, this warning does not have anything to do with this request.