Ticket #11327: null-in-widget-classname.patch

wp-includes/widgets.php

@@ -868 +868 @@
                 $classname_ = '';
                 foreach ( (array) $wp_registered_widgets[$id]['classname'] as $cn ) {
                         if ( is_string($cn) )
-                                $classname_ .= '_' . $cn;
+                                $classname_ .= '_' . ltrim($cn,"\0");
                         elseif ( is_object($cn) )
                                 $classname_ .= '_' . get_class($cn);
                 }