Explorer crashes while addin is running...

need help...
I am trying to run an addin in debug mode in EPDM. Each time the state is changed, the explorer crashes and restarts. If I start debugging the AddIn in Visual Studio everything is fine.

The addin responds after the status change with:
"PoCmdMgr.AddHook (EdmCmdType.EdmCmd_PostState);"

The Windows Event Viewer reports the following error:

Name der fehlerhaften Anwendung: Explorer.EXE, Version: 6.1.7601.23537, Zeitstempel: 0x57c44efe

Name des fehlerhaften Moduls: ntdll.dll, Version: 6.1.7601.23572, Zeitstempel: 0x57fd0651

Ausnahmecode: 0xc0000374

Fehleroffset: 0x00000000000bf3e2

ID des fehlerhaften Prozesses: 0x14dc

Startzeit der fehlerhaften Anwendung: 0x01d25b9cc06bc96a

Pfad der fehlerhaften Anwendung: C:\Windows\Explorer.EXE

Pfad des fehlerhaften Moduls: C:\Windows\SYSTEM32\ntdll.dll

Berichtskennung: d4a87c4c-c791-11e6-9341-f0bf97e1423f

Has anyone ever had such an error? Although the exlorer crashes the addin is running properly.

I am at a loss.

Any help would be appreciated.

Thanks, Mario