This is reproducible.

To reproduce:

Delete ~/.es/67 directory.
Start estudio and compile with attached class and config file.
Click on Run button.
When execution stops due to assertion violation, show AutoTest tool.
Select Create New Test/Extract Tests from Debugger.
Confirm compilation with testing library.
Click Next, Next, then Launch.
(Note that status line still says Generating Metadata).
Select Create New Test/Generate tests for custom types.
Click Next, Next, then Launch.
Estudio crashes with previously submitted exception trace.