Your project should not use invalid return types

More information: https://insight.symfony.com/what-we-analyse/php.invalid_return_typehint

in src/ImageParsers/AbstractGdImageParser.php, line 65 
  1.     protected function toPngData(\GdImage $image): string
  2.     {
  3.         \ob_start();
  4.         \imagepng($image);
  6.         return \ob_get_clean();
    
    
    Method fpdf\ImageParsers\AbstractGdImageParser::toPngData() should return string but returns string|false.
    
    
    
                    
    Time to fix: about 9 minutes
    
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                                    Last edited  by Bibi
                    
                            
    
        
    
    
  7.     }
  9.     /**
  10.      * @return resource
  11.      */