title: SSMS crashes when try to modify database diagram (v18.2)
body: <p>When I try to modify a database diagram created before the application restart and crashes when trying to access.
  It happen only when I save the diagram and close the application. When I try to reopen it throws me an error then restart the SSMS.</p>
  
  <p>I'm running SQL Server 14.0.100 Express Edition.</p>
  
  <p>I reviewed the Microsoft Event Viewer and I get this:</p>
  
  <blockquote>
    <p>Faulting application name: Ssms.exe, version: 2019.150.18142.0, time stamp: 0x5d3573be
    Faulting module name: DataDesigners.dll, version: 2019.150.18142.0, time stamp: 0x5d3573f0
    Exception code: 0xc0000005
    Fault offset: 0x00004be8
    Faulting process id: 0x5ec8
    Faulting application start time: 0x01d56d761e232f6c
    Faulting application path: C:\Program Files (x86)\Microsoft SQL Server Management Studio 18\Common7\IDE\Ssms.exe
    Faulting module path: C:\Program Files (x86)\Microsoft SQL Server Management Studio 18\Common7\IDE\Tools\VDT\DataDesigners.dll
    Report Id: e797c8be-6448-4547-9f6f-146cd92d8178
    Faulting package full name: 
    Faulting package-relative application ID: </p>
  </blockquote>