Invalid argument supplied for foreach()

 /**


* Sets the features support for the post type.
  *


* @since 4.6.0

*/
 public function add_supports() {
  if ( ! empty( $this->supports ) ) {
   foreach ( $this->supports as $feature => $args ) {
    if ( is_array( $args ) ) {
     add_post_type_support( $this->name, $feature, $args );
    } else {
     add_post_type_support( $this->name, $args );
    }
   }
   unset( $this->supports );
  } elseif ( false !== $this->supports ) {
   // Add default features.
   add_post_type_support( $this->name, array( 'title', 'editor' ) );
  }
 }