fix: Null check for User existence

[Hamza-Mokiwa]

Pull Request

Description:

• user is null error

Related Issues:

[Reference any related issues or documents.]

Type of Change:

• [X] Bug Fix
• [ ] New Feature
• [ ] Enhancement
• [ ] Refactoring
• [ ] Documentation Update

Checklist:

• [x] My code follows the coding standards of this project.
• [x] I have performed a self-review of my code.
• [x] I have added/updated relevant documentation.
• [x] My changes generate no new warnings or errors.
• [x] I have tested my changes.

Reviewers:

• @CodeHermez

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.38%. Comparing base (c9a783f) to head (70661ff). Report is 34 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #630 +/- ## ======================================== Coverage 67.38% 67.38% ======================================== Files 94 94 Lines 1996 1996 Branches 67 67 ======================================== Hits 1345 1345 Misses 606 606 Partials 45 45 ```

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