PHP 8.1 compatibility issue

SHUTDOWN ERROR:{"type":8192,"message":"Return type of C_Image_Wrapper_Collection::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice","file":"\/home\/dhammadhara\/public_html\/wp-content\/plugins\/nextgen-gallery\/products\/photocrati_nextgen\/modules\/nextgen_data\/package.module.nextgen_data.php","line":3994}