WARNING: Exception calling callback
java.lang.IllegalStateException: Attempted to decrement the reference count below 0
	at com.mongodb.binding.AbstractReferenceCounted.release(AbstractReferenceCounted.java:23)
	at com.mongodb.binding.AsyncClusterBinding$AsyncClusterBindingConnectionSource.release(AsyncClusterBinding.java:111)
	at com.mongodb.operation.OperationHelper$3$1.onResult(OperationHelper.java:219)
	at com.mongodb.async.SingleResultFuture.init(SingleResultFuture.java:102)
	at com.mongodb.operation.FindOperation$2$1.onResult(FindOperation.java:474)
	at com.mongodb.operation.FindOperation$2$1.onResult(FindOperation.java:468)
	at com.mongodb.async.SingleResultFuture.init(SingleResultFuture.java:102)
	at com.mongodb.connection.SingleResultFutureCallback.onResult(SingleResultFutureCallback.java:32)
	at com.mongodb.connection.QueryResultCallback.callCallback(QueryResultCallback.java:73)
	at com.mongodb.connection.ResponseCallback.onResult(ResponseCallback.java:49)
	at com.mongodb.connection.ResponseCallback.onResult(ResponseCallback.java:24)
	at com.mongodb.connection.UsageTrackingInternalConnection$3.onResult(UsageTrackingInternalConnection.java:131)
	at com.mongodb.connection.UsageTrackingInternalConnection$3.onResult(UsageTrackingInternalConnection.java:127)
	at com.mongodb.connection.InternalStreamConnection.processPendingResults(InternalStreamConnection.java:525)
	at com.mongodb.connection.InternalStreamConnection.processPendingReads(InternalStreamConnection.java:410)
	at com.mongodb.connection.InternalStreamConnection.access$1200(InternalStreamConnection.java:56)
	at com.mongodb.connection.InternalStreamConnection$3.onResult(InternalStreamConnection.java:445)
	at com.mongodb.connection.InternalStreamConnection$3.onResult(InternalStreamConnection.java:435)