fix format exception on invalid input

[adapik]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.46%. Comparing base (9d9ec74) to head (f093c7b).
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Additional details and impacted files

@@             Coverage Diff              @@
##             master      #15      +/-   ##
============================================
- Coverage     95.81%   95.46%   -0.36%     
- Complexity      337      338       +1     
============================================
  Files            34       34              
  Lines           813      815       +2     
============================================
- Hits            779      778       -1     
- Misses           34       37       +3     

Flag	Coverage Δ
unittests	95.46% <100.00%> (-0.36%)	⬇️

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