sunny but closing this anyway.... closes, https://github.com/opnsense/core/issues/1020

(cherry picked from commit d28c4632)

src/www/interfaces_qinq_edit.php

@@ -26,7 +26,6 @@
     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     POSSIBILITY OF SUCH DAMAGE.
 */
-error_reporting(E_ALL);
 
 require_once("guiconfig.inc");
 require_once("interfaces.inc");