Handle edge cases in caching

**Problem**
When working with helpers, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

The issue does not name any files, tests, or entry points. Start by locating the helper and caching code, then inspect how errors are currently handled and identify reproducible edge cases. Done means the relevant failures produce detailed, useful error messages and the behavior is covered by tests.

Written by the indexing model from the issue text.