Blank Screen after Activating CSS-Optimization

In some -rare, this is only the 2nd time I see this- cases the new CSS optimizer backfires, leaving nothing but a blank page. In that case you can force Autoptimize to use the legacy CSS minifier by adding this to your wp-config.php:

define("AUTOPTIMIZE_LEGACY_MINIFIERS","true");

hope this helps,
frank

@pmcm; I’m working on 1.7.1 and would like Autoptimize to fail less … visible. Would you be willing make a small temporary change to autoptimizeStyles.php to see if that “fixes” the white screen?

2 changes actually;

1. seeing if we get an error on the actual inclusion of the cssmin-library;

1. in wp-content/plugins/autoptimize/autoptimize.php on line 117 change

   @include(WP_PLUGIN_DIR.'/autoptimize/classes/external/php/yui-php-cssmin-2.4.8-1.php');

   to

   include(WP_PLUGIN_DIR.'/autoptimize/classes/external/php/yui-php-cssmin-2.4.8-1.php');

2. in wp-config.php remove
   define("AUTOPTIMIZE_LEGACY_MINIFIERS","true");
3. empty autoptimize cache and see if you get an ugly error instead of a white screen
4. if so, revert the 2 above changes
5. if not, revert 1st change and continue to (2)

2. if you still have a white screen (i.e. no ugly error), this change aims to have autoptimize fail more gracefully.

1. open wp-content/plugins/autoptimize/classes/autoptimizeStyles.php and on line 275 change

   //Minify
   if (class_exists('Minify_CSS_Compressor')) {
   	// legacy
   	$code = trim(Minify_CSS_Compressor::process($code));
   } else if(class_exists('CSSmin')) {
   	$cssmin = new CSSmin();
   	$code = trim($cssmin->run($code));
   }

   into the safer

   //Minify
   try {
   	if (class_exists('Minify_CSS_Compressor')) {
   		// legacy
   		$tmp_code = trim(Minify_CSS_Compressor::process($code));
   	} else if(class_exists('CSSmin')) {
   		$cssmin = new CSSmin();
   		$tmp_code = trim($cssmin->run($code));
   	}
   } catch (Exception $e) {
   	$CSSMinError = $e->getMessage();
   	$this->ao_logger("Could not minimize because: ".$CSSMinError);
   }
   
   if (!empty($tmp_code)) {
   	$code=$tmp_code;
   	unset($tmp_code);
   }

2. with the AUTOPTIMIZE_LEGACY_MINIFIERS still removed from wp-config.php, empty the autoptimize cache and try if you get a white page now

After these tests you can revert all changes, off course!

thanks for your help!

frank

weird … an internal server error upon including the new cssmin-library?

could you try to change

@include(WP_PLUGIN_DIR.'/autoptimize/classes/external/php/yui-php-cssmin-2.4.8-1.php');

in wp-content/plugins/autoptimize/autoptimize.php into

try{
	include(WP_PLUGIN_DIR.'/autoptimize/classes/external/php/yui-php-cssmin-2.4.8-1.php');
} catch (Exception $e) {
	$CSSMinError = $e->getMessage();
	$this->ao_logger("Could not load minimizer: ".$CSSMinError);
}

I’ve just pushed a first test-version of 1.7.2 to the plugin repository with some extra checks before loading the minifiers, so it might fix the blank screen problem. You can download the test-version here. Looking forward to your feedback!