How to reproduce:
1. Open the user's attached project
2. Open the Console (Window > General > Console)
3. In the top menu bar select Example > ObjectField Example
4. In the ExampleClass window double-click on the selected '19_what_matej' Asset
5. Observe the Console
6. If the issue doesn't reproduce repeat steps 4 and 5 (usually reproduces on the first try, however occasionally it may take up to 8 tries)

Expected result: There are no visible errors present
Actual result: The 'GUI Error: You are pushing more GUIClips than you are popping. Make sure they are balanced.' gets thrown in the Console

Reproducible with: 2019.4.0f1, 2019.4.15f1, 2020.1.15f1, 2020.2.0b13, 2021.1.0a7
Not reproducible with: 2018.4.29f1