"This AdWidget is already in the Widget tree" —...

The Error I was working on a Flutter app that uses google_mobile_ads for banner ads. One day, I got this error on the MyPage screen: This AdWidget is already in the Widget tree Make sure you are not using the same ad object in more than one AdWidget. The error message was clear. But the weird thing was — it didn't always happen. Finding the Pattern I tested different scenarios and found a pattern: Switch tabs normally → no crash Go to another page and come back → no crash Update address → go bac