closes #7053

src/meta/minifier.js

@@ -42,6 +42,7 @@ Minifier.killAll = function () {
 	});
 
 	pool.length = 0;
+	free.length = 0;
 };
 
 function getChild() {

src/middleware/index.js

@@ -217,6 +217,10 @@ middleware.buildSkinAsset = function (req, res, next) {
 		async.waterfall([
 			async.apply(plugins.prepareForBuild, ['client side styles']),
 			async.apply(meta.css.buildBundle, target[0], true),
+			function (next) {
+				require('../meta/minifier').killAll();
+				next();
+			},
 		], next);
 	} else {
 		setImmediate(next);