GH-3406 another attempt to fix crash

[DmitryBespalov]

Handles #3406

Changes proposed in this pull request:

• Potential reason: crash in arithmetic operations

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 8.25%. Comparing base (4cf664a) to head (fb255a5).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...Management/KeystoneOwnerKey/KeystoneSignFlow.swift	0.00%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #3420      +/-   ##
========================================
- Coverage   8.25%   8.25%   -0.01%     
========================================
  Files        788     788              
  Lines      44210   44211       +1     
========================================
  Hits        3648    3648              
- Misses     40562   40563       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.