protected function _renderStylesheets() { if ($this->_checkProcessing() === false) { return parent::_renderStylesheets(); } if (count($this->getStylesheets()) == 0) { return ''; } $stylesheetMinifyUrl = implode(',', $this->getStylesheets()); $this->clearStylesheets(); parent::addStylesheet('/minify/?f=' . $stylesheetMinifyUrl); return parent::_renderStylesheets(); }