I tried to open the System Events dictionary at work and I got a crash. Sent report from crash reporter.
I was able to reproduce the crash at home, but no crash reporter appeared in SD.
Here’s the steps that led to the crash:
Open System Events dictionary
Switch to explorer
Quit system events (from the dictionary window tool bar)
Close the dictionary window
Open the dictionary window and select System Events from favorites
Crash.
–> Script Debugger 7.0.1 (7A48)
–> Mac OS 10.13.3 (17D102)
Tried once more before updating, and it crashed with the crash reporter.
The key seems to be that the if the dictionary was last viewed in explorer mode and you open a new dictionary window when the app is no longer running, it crashes when you click the Launch button in the dialog (although in one crash I may not have seen the dialog).
Also, it may happen the second time you repeat all those steps.