From e6347a94e7ff0b7a5c1db7e6f83f50d93c2d4545 Mon Sep 17 00:00:00 2001
From: siikamiika <siikamiika@users.noreply.github.com>
Date: Mon, 2 Mar 2020 23:26:55 +0200
Subject: [PATCH] prepare Backend for browser_action

---
 ext/bg/js/backend.js | 5 +++++
 ext/bg/js/context.js | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index be43ecf6..14b0aff1 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -278,6 +278,11 @@ class Backend {
     // Message handlers
 
     async _onApiYomichanCoreReady(_params, sender) {
+        // tab ID isn't set in background (e.g. browser_action)
+        if (typeof sender.tab === 'undefined') {
+            return chrome.runtime.sendMessage({action: 'backendPrepared'});
+        }
+
         const tabId = sender.tab.id;
         return new Promise((resolve) => {
             chrome.tabs.sendMessage(tabId, {action: 'backendPrepared'}, resolve);
diff --git a/ext/bg/js/context.js b/ext/bg/js/context.js
index bec964fb..1095c7e0 100644
--- a/ext/bg/js/context.js
+++ b/ext/bg/js/context.js
@@ -48,7 +48,9 @@ function setupButtonEvents(selector, command, url) {
     }
 }
 
-window.addEventListener('DOMContentLoaded', () => {
+window.addEventListener('DOMContentLoaded', async () => {
+    await yomichan.prepare();
+
     showExtensionInfo();
 
     apiGetEnvironmentInfo().then(({browser}) => {