fix: added guard for edge case causing potential panic

[fredbi]

• fixes Svace fix #224

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.45%. Comparing base (4f79daa) to head (826d27f).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
expander.go	0.00%	1 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   67.51%   67.45%   -0.06%     
==========================================
  Files          30       30              
  Lines        2395     2397       +2     
==========================================
  Hits         1617     1617              
- Misses        615      616       +1     
- Partials      163      164       +1     

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