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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)