Error/warning message

Hi Tom ?? Thanks for creating this awesome plugin – it’s exactly what I was looking for! I’ve only got one issue, and that is an error message that appears right above the first post on each page… I have no idea what it means, and was hoping that you did. From what I can tell, it’s not effecting any other plugin. Any help with this would be greatly appreciated. Thank so much in advance ??

This is the error/warning:

Warning: urldecode() expects parameter 1 to be string, array given in /home4/magdalf1/public_html/wp-includes/class-wp-query.php on line 2092