From 50827582b6288c987463be4530ee7950ade05215 Mon Sep 17 00:00:00 2001
From: Joas Schilling <coding@schilljs.com>
Date: Mon, 6 May 2019 11:28:18 +0200
Subject: [PATCH] Make sure all middlewares are only registered once

Signed-off-by: Joas Schilling <coding@schilljs.com>
---
 lib/private/AppFramework/DependencyInjection/DIContainer.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/private/AppFramework/DependencyInjection/DIContainer.php b/lib/private/AppFramework/DependencyInjection/DIContainer.php
index fc16521cf3..209ea5c876 100644
--- a/lib/private/AppFramework/DependencyInjection/DIContainer.php
+++ b/lib/private/AppFramework/DependencyInjection/DIContainer.php
@@ -299,6 +299,9 @@ class DIContainer extends SimpleContainer implements IAppContainer {
 	 * @return boolean|null
 	 */
 	public function registerMiddleWare($middleWare) {
+		if (in_array($middleWare, $this->middleWares, true) !== false) {
+			return false;
+		}
 		$this->middleWares[] = $middleWare;
 	}