Crash after fastly closing and restarting the launcher

Same like in MCL-10817, but I'm unable to reopen this issue, so let's make a new one 😉

The launcher crashes if you fastly close an existing instance and immediately start a new one.

Following Windows-Error-Report:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="Application Error" /> 
  <EventID Qualifiers="0">1000</EventID> 
  <Level>2</Level> 
  <Task>100</Task> 
  <Keywords>0x80000000000000</Keywords> 
  <TimeCreated SystemTime="2019-07-23T12:55:19.780567000Z" /> 
  <EventRecordID>3315</EventRecordID> 
  <Channel>Application</Channel> 
  <Computer>Ryzen-PC</Computer> 
  <Security /> 
  </System>
- <EventData>
  <Data>MinecraftLauncher.exe</Data> 
  <Data>1.0.1.0</Data> 
  <Data>5d2dd613</Data> 
  <Data>ntdll.dll</Data> 
  <Data>10.0.18362.1</Data> 
  <Data>9bbcb4a9</Data> 
  <Data>c0000005</Data> 
  <Data>00063bd3</Data> 
  <Data>2c0c</Data> 
  <Data>01d54155e0027277</Data> 
  <Data>C:\Program Files (x86)\Minecraft\MinecraftLauncher.exe</Data> 
  <Data>C:\WINDOWS\SYSTEM32\ntdll.dll</Data> 
  <Data>4219feb9-b0a3-42ec-a815-dcf9aacc68ce</Data> 
  <Data /> 
  <Data /> 
  </EventData>
  </Event>