polylang : Warning: in_array() expects parameter 2 to be array

I have the same error.

This is the line of code:

$is_post_type = isset($qvars['post_type']) && (in_array($qvars['post_type'], $this->post_types) ||
			 (is_array($qvars['post_type']) && array_intersect($qvars['post_type'], $this->post_types)) );

Thanks for your quick response… That worked like a charm!