Guard against undefined forward refs

[philippjfr]

In some scenarios forward refs are not provided and in those scenarios we should guard against that.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.14%. Comparing base (f3101ae) to head (0657627).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #699   +/-   ##
=======================================
  Coverage   85.14%   85.14%           
=======================================
  Files          33       33           
  Lines        3844     3844           
=======================================
  Hits         3273     3273           
  Misses        571      571           

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