diff --git a/writeas/AppDelegate.swift b/writeas/AppDelegate.swift
index 47ccc94..f8427aa 100644
--- a/writeas/AppDelegate.swift
+++ b/writeas/AppDelegate.swift
@@ -45,7 +45,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
     
     func applicationDidBecomeActive(_ notification: Notification) {
         if vc == nil {
-            vc = NSApplication.shared().mainWindow?.contentViewController as! ViewController
+            vc = NSApplication.shared().mainWindow?.contentViewController as? ViewController
         }
     }