IllegalStateException scheduling transport activity timer

[paddybyers]

I'm seeing a crash in AblyRealtime on Android. It looks like in WebSocketTransport, a timer is set that checks to see if the connection should be automatically closed. When the timer is canceled, the active implementation throws an IllegalStateException (Timer was canceled), which isn't handled and causes the app to crash. I'd like either support to help identifying how we can avoid canceling this task when closing the app, or updating the SDK so that it doesn't crash when this timer is canceled.

[paddybyers]

Stack trace:

Fatal Exception: java.lang.IllegalStateException

Timer already cancelled.

Raw Text

java.util.Timer.sched (Timer.java:397)
java.util.Timer.schedule (Timer.java:193)
io.ably.lib.transport.WebSocketTransport$WsClient.checkActivity (WebSocketTransport.java:294)
io.ably.lib.transport.WebSocketTransport$WsClient.access$500 (WebSocketTransport.java:146)
io.ably.lib.transport.WebSocketTransport$WsClient$WsClientTimerTask.run (WebSocketTransport.java:313)
java.util.TimerThread.mainLoop (Timer.java:555)
java.util.TimerThread.run (Timer.java:505) 

[paddybyers]

I'm looking at this:

https://docs.oracle.com/javase/7/docs/api/java/util/Timer.html

If the timer's task execution thread terminates unexpectedly, for example, because its stop method is invoked, any further attempt to schedule a task on the timer will result in an IllegalStateException