#81 fix index corruption

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Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 87.07%. Comparing base (b7c6942) to head (e20e7ab).

Files with missing lines	Patch %	Lines
jsonpath.go	70.00%	2 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #82 +/- ## ========================================== - Coverage 87.13% 87.07% -0.06% ========================================== Files 11 11 Lines 3156 3165 +9 ========================================== + Hits 2750 2756 +6 - Misses 324 326 +2 - Partials 82 83 +1 ``` | [Flag](https://app.codecov.io/gh/spyzhov/ajson/pull/82/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stepan+Pyzhov) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/spyzhov/ajson/pull/82/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stepan+Pyzhov) | `87.07% <70.00%> (-0.06%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Stepan+Pyzhov#carryforward-flags-in-the-pull-request-comment) to find out more.

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