System.InvalidOperationException : Stack is null or empty.

[aleks2910]

System.InvalidOperationException : Stack is null or empty.

Steps to reproduce:

 using (var db = new Db("master"))
{
   //  HttpContext.Current  have to be null yet
    db.Configuration.Settings["someKey"] = "someValue";  
 
   HttpContext.Current = new SomeFakeContext(); 
  
   db.Configuration.Settings["someKey"] = "someValue"; //  I think any key and value  behave the same
} // exception is here - in the  Dispose

Stack Trace:

 Switcher`2.Exit()
        Switcher`2.Dispose()
        Settings.Dispose()
        DbConfiguration.Dispose()
        Db.Dispose(Boolean disposing)
        Db.Dispose()

Sitecore.Kernel 10.1.1

Workaround:
set HttpContext.Current before using db.Configuration.Settings!