Microsoft Endpoint Configuration Manager version 2006 KB4575786.

After installing the following update rollup, the Configuration Manager console terminates unexpectedly.
KB 4578605 Update Rollup for Microsoft Endpoint Configuration Manager version 2006

This occurs if the user is not a member of the Full Administrator security role and switches between different nodes of the console. For example, a user that is a member of the Remote Tools Operator security role, and selects the Devices node in the console will encounter this issue.
Event ID 1026 is recorded in the Application Event log with details resembling the following.

Application: Microsoft.ConfigurationManagement.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Collections.Generic.KeyNotFoundException
   at System.Collections.Generic.Dictionary`2[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].get_Item(System.__Canon)...