fix plugin load

src/content/components/common/index.js

@@ -32,6 +32,10 @@ export default class Common {
       type: messages.SETTINGS_QUERY,
     }).then((settings) => {
       this.store.dispatch(settingActions.set(settings));
+    }).catch((e) => {
+      // Sometime sendMessage fails when background script is not ready.
+      console.warn(e);
+      setTimeout(() => this.reloadSettings(), 500);
     });
   }
 }

src/content/reducers/setting.js

@@ -1,6 +1,8 @@
 import actions from 'content/actions';
 
-const defaultState = {};
+const defaultState = {
+  keymaps: {},
+};
 
 export default function reducer(state = defaultState, action = {}) {
   switch (action.type) {