PHP notice and warning

Hi there

I am seeing this notice and warning

Notice: Trying to get property of non-object in /plugins/advanced-post-slider/advanced-post-slider.php on line 295

Warning: in_array() expects parameter 2 to be array, null given in /plugins/advanced-post-slider/advanced-post-slider.php on line 295

This is the code from around line 295 in advanced-post-slider.php

{
					$post_type_obj = get_post_type_object( $query['advps_post_types'] );
					if(in_array('category',$post_type_obj->taxonomies)){
						if(isset($query['advps_category'])){
							$query_arg['cat'] = implode(',',$query['advps_category']);
						}
					}
				}
			}
		}

This message is displayed when debug is set to true.

Kind Regards
Brad