This bug was filed from the crash reporting server and is br-d0662f7e-8e98-491d-9834-761b6550b6d5. =========================================
Tools>Options>Language settings>Languages>check/uncheck DecimalSeparatorKey then click OK causes the crash.
I can't confirm it with Version: 6.4.0.0.alpha0+ (x64) Build ID: 01837a85004a6f891a09c0a63ed7eff75d634827 CPU threads: 4; OS: Windows 10.0; UI render: GL; VCL: win; TinderBox: Win-x86_64@62-TDF, Branch:master, Time: 2019-09-01_00:07:05 Locale: en-GB (de_DE); UI-Language: en-US Calc: threaded
On Win10 with LO 6.3.0.4, I don't reproduce this. Could you give a try to 6.3.1? Indeed, perhaps you just encountered a bug already fixed.
Right. I did not realize my work computer was out of date. With Version: 6.3.1.1 (x64) Build ID: e979878b49a48dab15ebe528f238b88125e32c65 the bug has vanished.