The obtained blockNumber from getBlockNumber is not mined

[dnoishi]

Hello everyone!

I have this issue, in the docs it mention that the function getBlockNumber gives you back the lastest mined block number but when I try to use it to read a function from a contract I get an error that the blockNumber is not yet mined.

Does anyone knows why this happens?

[zemse]

Are you using ethers.getDefaultProvider()? (or let me know info about your provider). The getDefaultProvider gives you a fallback provider, which has multiple nodes behind it which may not be in sync with the latest block. So maybe you were served getBlockNumber from a node that is up to date while the call was served from another node that was few blocks behind. A trival solution would be to use a single node instead of Fallback provider for this purpose (using StaticJsonRpcProvider)