Fix illegal offset type

[zingimmick]

No description provided.

[codecov]

Codecov Report

Merging #3 (ce58b9d) into master (de7a89f) will decrease coverage by 1.40%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master       #3      +/-   ##
============================================
- Coverage     96.58%   95.18%   -1.41%     
  Complexity       39       39              
============================================
  Files             3        3              
  Lines           117       83      -34     
============================================
- Hits            113       79      -34     
  Misses            4        4              

Impacted Files	Coverage Δ
src/Relations/BelongsToOne.php	100.00% <100.00%> (ø)
src/Relations/MorphToOne.php	94.73% <100.00%> (ø)
src/HasMoreRelationships.php	93.33% <0.00%> (-2.87%)	⬇️

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