Bugfix 43

[RobinBuschmann]

see #43

[codecov-io]

Codecov Report

Merging #53 into master will increase coverage by 0.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   95.55%   95.57%   +0.01%     
==========================================
  Files          65       65              
  Lines         742      745       +3     
  Branches      100      101       +1     
==========================================
+ Hits          709      712       +3     
  Misses         11       11              
  Partials       22       22

Impacted Files	Coverage Δ
lib/services/association.ts	92.7% <75%> (+0.23%)	⬆️

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