From 4ba827fc15a67e8c09925655fa3b638c817b3011 Mon Sep 17 00:00:00 2001
From: Nils Maier <maierman@web.de>
Date: Fri, 11 Oct 2019 15:28:38 +0200
Subject: [PATCH] Make sure we're on background

---
 lib/manager/man.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/manager/man.ts b/lib/manager/man.ts
index 032579e..bfc2c37 100644
--- a/lib/manager/man.ts
+++ b/lib/manager/man.ts
@@ -61,6 +61,9 @@ export class Manager extends EventEmitter {
   private deadlineTimer: number;
 
   constructor() {
+    if (!document.location.href.includes("background")) {
+      throw new Error("Not on background");
+    }
     super();
     this.active = true;
     this.shouldReload = false;