Smack - Thread starting during runtime shutdown

Hi, I just received one strange error message from crashlytics. Is it any known bug? I’m using Smack version 4.1.0-alpha5. Thanks!

java.lang.InternalError: Thread starting during runtime shutdown
       at java.lang.Thread.nativeCreate(
       at java.lang.Thread.start(
       at org.jivesoftware.smack.util.Async.go(
       at org.jivesoftware.smack.AbstractXMPPConnection.firePacketSendingListeners(
       at org.jivesoftware.smack.tcp.XMPPTCPConnection.access$3300(
       at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter.writePackets(
       at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter.access$2800(
       at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter$

“Thread starting during runtime shutdown” means that Smack started a thread while the runtime was shuting down. I see no problem/bug here. You could avoid it, by making sure that all XMPPConnections are disconnected when terminating the runtime.

Should be the problem similar to this java.lang.InternalError: Thread starting during runtime shutdown · Issue #136 · ACRA/acra · GitHub? The problem occurs only on ART runtime.

Is there a problem besides the exception? Or does the exception occur when the runtime is not in the process of terminating?