Does it crash when you open the script editor or when running your script? Your script may do something invalid with the current model.
You can also try running in "run" mode. The debug mode runs in a different thread, allowing you to click in the model window while it runs and possibly confusing the script. Click the pulldown by the right-pointing triangle at the upper right of the script editor, and choose "Run." Then use that same green triangle to run the script:
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