add more logs during exceptional cases

[pinux-studio]

@i-maravic @narape @badrock

[codecov-io]

Current coverage is 75.56% (diff: 33.33%)

Merging #17 into master will decrease coverage by 0.36%

@@             master        #17   diff @@
==========================================
  Files            24         24          
  Lines           839        843     +4   
  Methods           0          0          
  Messages          0          0          
  Branches         69         70     +1   
==========================================
  Hits            637        637          
- Misses          169        172     +3   
- Partials         33         34     +1   

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[narape]

:+1:

[pinux-studio]

!merge