Summary

The _extractPeriodFromProof function in the contract includes a require(slot.exists) check without an accompanying error message. While this does not introduce a security vulnerability, it reduces the clarity of transaction failures, making it harder to diagnose issues during debugging or emergencies.

Affected Code: _extractPeriodFromProof

Impact

The lack of an error message in the require statement has the following implications:

• Troubleshooting Difficulty: When the condition fails, the transaction reverts with a generic error ("Transaction reverted without a reason string"). This makes it challenging to identify the root cause of the failure.

• Emergency Response: During exploits or unexpected behavior, the absence of informative error messages can delay critical fixes, wasting valuable time.

• User Experience: Users interacting with the contract may be confused by generic revert messages, leading to a poor experience.

Recommendations

1. Add an Error Message:

   • Update the require statement to include a descriptive error message:

     require(slot.exists, "Period slot does not exist in proof");

Reference

This issue aligns with the finding documented in the following reference:

• Code4rena Report: L-03 Missing Error Messages in require Statements