Division by 0 error

$thumb = wp_get_attachment_image_src( get_post_thumbnail_id( get_the_ID() ), $args['size'] );

	$use_ellipsis = false;

	if ( is_array( $thumb ) ) {
		$thumb_width  = absint( $thumb[1] );
		$thumb_height = absint( $thumb[2] );

		// Use ellipsis.
		if ( $args['use_ellipsis'] ) {
			$ratio = 0 !== $thumb_width ? $thumb_height / $thumb_width : 0;
			$use_ellipsis = $ratio > ( 3 / 1 ) ? true : false;
		}

		// Use sizer. Prevent image loading jump.
		if ( true === $args['use_sizer'] ) {
			$inner_style_escaped = ' style="padding-bottom: ' . sprintf( "%.8F", $thumb[2] / $thumb[1] * 100   ) . '%;"';
		}
		
	}

“$thumb[2] / $thumb[1] * 100” this line returns a division by 0 error.
I think this error is there because the width of the external image is set to auto, can you help me correct this.