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MumbleKit crashes when accessing groups

Everything related to the official iOS Mumble client
I defined a group to a sub-channel and suitable permissions. (see attachments)
From MumbleKit, after being connected to the server, I ask for MKAccessControl by calling

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[self.serverModel requestAccessControlForChannel:c];
When receiving response, app crashes in this point (see (*) )

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- (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState *)state objects:(id *)stackbuf count:(NSUInteger)len
	// TODO: We only support enumeration of object values.  In the future, we
	// can extend this code to return a new list of NSNumber* objects wrapping
	// our primitive values.
	PBArrayValueTypeAssert(PBArrayValueTypeObject);  <----- (*)

	if (state->state >= _count)
		return 0; // terminate iteration
How should I set groups and permission on murmur to avoid this crash?

If I comment the assert, the following crash is when accessing the PBArray named add in here:

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        for (NSNumber *value in chanGroup.add) {
            [channelGroup.members addObject:value];



I'm not very familiar with the access control code. It's an external contribution -- an app that used MumbleKit needed ACLs. (Mumble for iOS doesn't for now).

However, I'd love to take a stab at it. I've created an issue to track this bug: