Issues displaying value after/value before for entity reference

i have this error with the view that render a entity reference chances an also i use Corresponding Entity References for this entity reference field

Strict warning: Only variables should be passed by reference in track_field_changes_handler_field_value_after->render() (line 40 of /home/webstral/public_html/crm/sites/all/modules/track_field_changes/views/track_field_changes_handler_field_value_after.inc).
Strict warning: Only variables should be passed by reference in track_field_changes_handler_field_value_after->render() (line 40 of /home/webstral/public_html/crm/sites/all/modules/track_field_changes/views/track_field_changes_handler_field_value_after.inc).
Strict warning: Only variables should be passed by reference in track_field_changes_handler_field_value_after->render() (line 40 of /home/webstral/public_html/crm/sites/all/modules/track_field_changes/views/track_field_changes_handler_field_value_after.inc).
Strict warning: Only variables should be passed by reference in track_field_changes_handler_field_value_before->render() (line 40 of /home/webstral/public_html/crm/sites/all/modules/track_field_changes/views/track_field_changes_handler_field_value_before.inc).
Strict warning: Only variables should be passed by reference in track_field_changes_handler_field_value_before->render() (line 40 of /home/webstral/public_html/crm/sites/all/modules/track_field_changes/views/track_field_changes_handler_field_value_before.inc).
Strict warning: Only variables should be passed by reference in track_field_changes_handler_field_value_after->render() (line 40 of /home/webstral/public_html/crm/sites/all/modules/track_field_changes/views/track_field_changes_handler_field_value_after.inc).

the rest of the fields that are not entity reference are working .