[Refactoring] [Attempt to fix crash]

src/redux/actions/error_actions.js

@@ -1,4 +1,7 @@
-import {showWindow, shutdownApplication} from './common_actions';
+import {
+  showWindow,
+  shutdownApplication
+} from './common_actions';
 
 let ErrorActions = [];
 
@@ -27,7 +30,7 @@ export const dismissError = () => {
 export const notifyError = (msg, critical, callback) => {
   return dispatch => {
     ErrorActions = [callback, ...ErrorActions];
-    msg = msg.toString();
+    msg = msg ? msg.toString() : 'Unknown Error';
     dispatch(setErrorInfo(msg, critical));
     dispatch(showWindow());
   };