Error Log Setting off Warnings

I am getting the following error (actually warning) in my server error logs.

I have the Display Errors setting to OFF but the server’s error log is getting large… how do I fix this? Here is the error:
PHP Warning: Invalid argument supplied for foreach() in /home/XXXX (I masked it)/public_html/templates/gk_the_real_design/html/com_content/article/default.php on line 12

Thankfully, the site works though and I am using the most current version of Joomla and I believe the template.

I cant put the site’s domain on here – can PM you if needed.

You have latest template version ? (2.8) ?