diff --git a/main.js b/main.js
index e1aa5286e5..d427952931 100644
--- a/main.js
+++ b/main.js
@@ -386,6 +386,9 @@ async function createWindow() {
   mainWindow.on('move', debouncedCaptureStats);
 
   const setWindowFocus = () => {
+    if (!mainWindow) {
+      return;
+    }
     mainWindow.webContents.send('set-window-focus', mainWindow.isFocused());
   };
   mainWindow.on('focus', setWindowFocus);