fix: callback was already called when code throw after set function

[mingchuno]

fix #437

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• What is the current behavior? (You can also link to an open issue here)

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[codecov-commenter]

Codecov Report

Merging #440 (0736f49) into master (2a2cd78) will increase coverage by 0.35%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master     #440      +/-   ##
==========================================
+ Coverage   81.76%   82.12%   +0.35%     
==========================================
  Files           2        2              
  Lines         181      179       -2     
  Branches       42       42              
==========================================
- Hits          148      147       -1     
+ Misses         22       21       -1     
  Partials       11       11              

Impacted Files	Coverage Δ
src/lib/MongoStore.ts	81.92% <60.00%> (+0.35%)	⬆️

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