Error message

• Notice: Trying to access array offset on value of type bool in addtocal_field_get_value() (line 391 of /sites/sites/all/modules/addtocal/addtocal.module).
• Notice: Trying to access array offset on value of type null in addtocal_field_get_value() (line 391 of /sites/sites/all/modules/addtocal/addtocal.module).