v2/indigo/calculate endpoint throws exception

**Steps to Reproduce**
1. Call v2/indigo/calculate'
options:
{
"aromatize-skip-superatoms": true,
"gross-formula-add-isotopes": true,
"gross-formula-add-rsites": true,
"ignore-stereochemistry-errors": true,
"mass-skip-error-on-pseudoatoms": false,
"smart-layout": true,
}

**Expected behavior**
Calculation is successfully with no exceptions

**Actual behavior**
502 HTTP code is gotten

[calculate endpoint throws exception.zip](https://github.com/epam/Indigo/files/8471989/calculate.endpoint.throws.exception.zip)