Problem with NotifyCharacteristicValue on Android

[TMNDevelop]

Hi this was my scenario:

1. I connected to a device where I set my NotifyCharacteristicValue.
2. connected to another device (everything is fine)
3. again to the first device, now I had two NotifyCharacteristicValue running.
   (maybe because of reuse of the connection...)

After this I added the dispose of the notifier, but what happened now, was:
If I call the dispose twice (which should cause nothing in MS-Standard), the app deeply crashes!

Now I had to check if the dispose of this device was already called, but that is not a nice solution.
Please can you check if your dispose twice also fails?

Thanks
Gerhard