FIX: fixed the way to retrieve non_graphical variable

[maxcapodi78]

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Issue linked

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Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.35%. Comparing base (706009c) to head (456f69b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6351      +/-   ##
==========================================
- Coverage   85.36%   85.35%   -0.01%     
==========================================
  Files         175      175              
  Lines       65798    65797       -1     
==========================================
- Hits        56169    56163       -6     
- Misses       9629     9634       +5     

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