Often have to press Search button two times in Model Browser to search of a model

[Neostead2009]

What happened?

When trying to search for a model using $# or full URL the first attempt often fails and message appears:

But if I press Search button again (or press Enter key) I get expected search result. Chance to see this error is very high.
Problem was there long before 2.15.0.

Steps to reproduce

1. Open Stability Matrix.
2. Go to Model Browser.
3. Try to search a model using $# or full URL of a model.

Relevant logs

Version

2.15.0

What Operating System are you using?

Windows

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove the stale label or comment, else this will be closed in 7 days.

[Neostead2009]

Sometimes the result is nothing - no found models, no error message. Searching again gives correct result.