java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)
at java.util.AbstractCollection.toString(AbstractCollection.java:372)
at org.json.JSONStringer.value(JSONStringer.java:252)
at org.json.JSONObject.writeTo(JSONObject.java:720)
at org.json.JSONStringer.value(JSONStringer.java:237)
at org.json.JSONObject.writeTo(JSONObject.java:720)
at org.json.JSONStringer.value(JSONStringer.java:237)
at org.json.JSONArray.writeTo(JSONArray.java:613)
at org.json.JSONArray.toString(JSONArray.java:585)
at java.lang.StringBuilder.append(StringBuilder.java:202)
at io.socket.parser.Parser$Encoder.encodeAsString(Parser.java:116)
at io.socket.parser.Parser$Encoder.encode(Parser.java:85)
at io.socket.client.Manager.packet(Manager.java:461)
at io.socket.client.Socket.packet(Socket.java:264)
at io.socket.client.Socket.access$1100(Socket.java:19)
at io.socket.client.Socket$5.run(Socket.java:201)
at io.socket.thread.EventThread$2.run(EventThread.java:75)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)

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