diff --git a/src/js/init.js b/src/js/init.js
index 7a36526bf..43b1f6054 100644
--- a/src/js/init.js
+++ b/src/js/init.js
@@ -256,8 +256,10 @@ let init = function () {
  * Quit the application
  */
 let allWindowsClosed = function () {
-    win.webContents.session.clearStorageData([], (data) => {});
-    win.webContents.session.clearCache((data) => {});
+    if (win !== null) {
+      win.webContents.session.clearStorageData([], (data) => {});
+      win.webContents.session.clearCache((data) => {});
+    }
     app.quit();
 };