[#10776] Set null if value is -1

[jihea-park]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.05%. Comparing base (56898af) to head (0d6a4bc).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #11561   +/-   ##
=========================================
  Coverage     37.05%   37.05%           
- Complexity    12232    12237    +5     
=========================================
  Files          4041     4042    +1     
  Lines         99057    99080   +23     
  Branches      10439    10443    +4     
=========================================
+ Hits          36701    36713   +12     
- Misses        59373    59381    +8     
- Partials       2983     2986    +3     

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