Summary

maxDelay is never 0 inside ChainlinkARBOracle.addTokenMaxDelay

Instead it should check that maxDelay is greater than 0.

Vulnerability Details

Inside ChainlinkARBOracle, the function addTokenMaxDelay
checks that maxDelay < 0. Since maxDelay is uint256, this will never be the case.

The correct check is to check that maxDelay != 0 or if (maxDelay == 0) { revert ... }

Impact

If maxDelay is set to 0 _chainlinkIsFrozen will likely return true and halting the function consult

Tools Used

Recommendations

Check maxDelay > MIN_DELAY where MIN_DELAY is some reasonable time greater than 0, for example 10 minutes