Hyperlink to Instructor profile not working

Got the following error code when clicking on the Instructor profile hyperlink from the course excerpt view :

Warning: array_keys() expects parameter 1 to be array, boolean given in /home/frenchwi/public_html/wp-content/plugins/coursepress/includes/classes/class.instructor.php on line 32

Warning: array_filter() expects parameter 1 to be array, null given in /home/frenchwi/public_html/wp-content/plugins/coursepress/includes/classes/class.instructor.php on line 32

Warning: Invalid argument supplied for foreach() in /home/frenchwi/public_html/wp-content/plugins/coursepress/includes/classes/class.instructor.php on line 47

Notes :
-my hyperlink structure is not set to default
-the instructor profile hyperlink works fine from the detailed course description