Hi Andreas,
On BTT 5.695 (macOS 15.6.1), I found a reproducible crash:
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Start with an empty BTT data folder.
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Create a named trigger.
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Add Run Real JavaScript action.
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Select all text in the editor and press Delete.
BTT quits instantly instead of clearing the text. Here is the crash log
BetterTouchTool-2025-10-10-103445.ips (38.5 KB)