Version 3.4.5

upload/public/min/config.php

@@ -82,7 +82,7 @@ $min_serveOptions['bubbleCssImports'] = false;
 $min_serveOptions['encodeOutput'] = 1;
 
 /* Tiny hack for IN_DEV */
-if ( isset( $_GET['f'] ) )
+if ( isset( $_GET['f'] ) && is_string( $_GET['f'] ) )
 {
 	if ( strstr( $_GET['f'], '/master_css' ) )
 	{