Error: php notice uninitialized string offset 0

When using the [poll] shortcode the debug log returns the error as shown below:

PHP Notice: Uninitialized string offset: 0 in D:\www\wordpress_new\wp-content\plugins\wp-polls\wp-polls.php on line 756

Possible cause: On line 756 in the wp-poll.php file the array $atts is called. It returns an error if not set in shortcode I think.

// To maintain backward compatibility with [poll=1]. Props @tz-ua
 if(!$id) {
    $id = intval( trim( $atts[0], '="\'' ) );
}

Possible solution I think could be something like this. Check if array is empty:

// To maintain backward compatibility with [poll=1]. Props @tz-ua
 if( empty($id) ) {
    // Do nothing
} else {
    $id = intval( trim( $atts[0], '="\'' ) );
}

https://www.ads-software.com/plugins/wp-polls/