Fix Swift 4.1 crash

[initFabian]

No description provided.

[codecov-io]

Codecov Report

Merging #31 into master will increase coverage by 6.43%.
The diff coverage is 85.29%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   87.53%   93.96%   +6.43%     
==========================================
  Files          25       25              
  Lines        1677     1426     -251     
  Branches      177        0     -177     
==========================================
- Hits         1468     1340     -128     
+ Misses        113       86      -27     
+ Partials       96        0      -96

Impacted Files	Coverage Δ
Tests/CelyStorageTests.swift	87.82% <100%> (+10.63%)	⬆️
Sources/Cely.swift	97.43% <100%> (+2.19%)	⬆️
Tests/CelyTests.swift	93.06% <50%> (+12.69%)	⬆️
Sources/CelyStorage.swift	81.15% <0%> (-4.39%)	⬇️
Cely Demo/ViewController.swift	62.5% <0%> (-1.14%)	⬇️
Cely Demo/User.swift	0% <0%> (ø)	⬆️
Tests/LoginStyleTests.swift	100% <0%> (ø)	⬆️
Sources/CelyWindowManager.swift	100% <0%> (ø)	⬆️
Sources/LocksmithSecurityClass.swift	100% <0%> (ø)	⬆️
Cely Demo/SettingsViewController.swift	0% <0%> (ø)	⬆️
... and 18 more

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