This is typically caused by a bad network connection or the wallet address doesn't have data on this game. We recommend trying a different network
You could also help report bugs/issues, there are a few other articles you may want to look over:
1. I found a bug or I want to give feedback, what do I do?
2. Why data real-time and data in-game transactions aren't synchronous?
3. Why did I add a wallet address but still don’t see data on Tracker?