Error when updating to 3.16.5

First of all I need to point out that I did not created quizzes so I do not have them

After upgrade my WP died returning only 500
I’ve disabled plugin via db. Ok – back to normal.

Then when I tried switch on Lifter form plugin manager then I got error (path partially anonymised):

Fatal error: Can’t use method return value in write context in /****/****/wp-content/plugins/lifterlms/includes/models/model.llms.question.php on line 406

So I modified file:

	public function has_image() {
// 		$img = $this->get( 'image' );
// 		if ( is_array( $img ) ) {
// 			if ( ! empty( $img['enabled'] ) && ( ! empty( $img['id'] ) || ! empty( $img['src'] ) ) ) {
// 				return ( 'yes' === $img['enabled'] );
// 			}
// 		}
 		return false;
	}

	/**
	 * Determine if a featured video is enabled & not empty
	 * @return   bool
	 * @since    3.16.0
	 * @version  3.16.0
	 */
	public function has_video() {
 //		return ( 'yes' === $this->get( 'video_enabled' ) && ! empty( $this->get( 'video_src' ) ) );
       return false;
	}

	/**
	 * Access question manager (used for question groups)
	 * @todo     need to prevent access for non-group questions...
	 * @return   obj
	 * @since    3.16.0
	 * @version  3.16.0
	 */

And it started – ok
Then I migrated DB – it passed.

What to do with this changes? Backup succeeded but should I care about this code modification?