Handle nil results in check

[Davidyz]

Closes #291

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.72%. Comparing base (8638df3) to head (c4f5ed4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #292   +/-   ##
=======================================
  Coverage   99.72%   99.72%           
=======================================
  Files          25       25           
  Lines        1838     1838           
=======================================
  Hits         1833     1833           
  Misses          5        5           

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