The launcher crashes if you fastly close an existing instance and immediately start a new one.
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Windows Error Report:
Description
Faulting Application Path: C:\Program Files (x86)\Minecraft\MinecraftLauncher.exe
Creation Time: 06.05.2019 17:40:52
Problem: Nicht mehr funktionsfähig
Status: Bericht gesendet
Problem signature
Problem Event Name: APPCRASH
Anwendungsname: MinecraftLauncher.exe
Anwendungsversion: 1.0.1.0
Anwendungszeitstempel: 5c6e4dda
Fehlermodulname: ntdll.dll
Fehlermodulversion: 10.0.17763.404
Fehlermodulzeitstempel: e1cce3af
Ausnahmecode: c0000005
Ausnahmeoffset: 00051e0b
Extra information about the problem
Bucket ID: 2b1e8495cb8871d60e086cfdecdbc636 (2164099458807875126)
This could be easily reproduced on Windows by trying to start Minecraft several times while it was running. Always crashed on 3:d attempt for me. Should be fixed now 🙂