It doesn't crash in my plugin though.
I made another picture for you to see what it looks like. Bear in mind, that this is only my hobby and I only know so much about using Visual Studio, but I don't think I can get more out of this dump
This is the call stack, which means that the method in the top is the one actually crashing, but you can trace down which method called the one beforehand. The first ~20 ones are from some dll files of windows. It is possible to freely get debug information about those from the microsoft servers -> I did this in this case, so you can see what is happening. It doesn't really matter, but it's nice to see the difference to where I cannot do this.
The last "windows-based" dll is ole32.dll (it's a framework for doing stuff with user interfaces) and the method has something to do with drag and drop. Nothing surprising here, because as you described, you force the crash by using drag and drop.
The next one is in qwindows.dll, which is part of the QT-Framework, which makes it easier for developers to make platform independent user interfaces. Teamspeak uses this.
So the bug is either in QT itself or in teamspeak, which calls the QT methods with inappropriate parameters. I can't get more information out of this. since I dont have debug information for either of those.