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java.lang.NullPointerException: 	at org.webrtc.PeerConnection.addStream(PeerConnection.java:148)	at fr.pchab.webrtcclient.WebRtcClient$Peer.(WebRtcClient.java:257)	at fr.pchab.webrtcclient.WebRtcClient.addPeer(WebRtcClient.java:264)	at fr.pchab.webrtcclient.WebRtcClient.access$900(WebRtcClient.java:29)	at fr.pchab.webrtcclient.WebRtcClient$MessageHandler$1.call(WebRtcClient.java:153)	at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)	at com.github.nkzawa.socketio.client.Socket.onevent(Socket.java:316)	at com.github.nkzawa.socketio.client.Socket.onpacket(Socket.java:280)	at com.github.nkzawa.socketio.client.Socket.access$100(Socket.java:18)	at com.github.nkzawa.socketio.client.Socket$2$2.call(Socket.java:101)	at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)	at com.github.nkzawa.socketio.client.Manager.ondecoded(Manager.java:377)	at com.github.nkzawa.socketio.client.Manager.access$1200(Manager.java:20)	at com.github.nkzawa.socketio.client.Manager$3.call(Manager.java:351)	at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)	at com.github.nkzawa.socketio.parser.Parser$Decoder.add(Parser.java:156)	at com.github.nkzawa.socketio.client.Manager.ondata(Manager.java:369)	at com.github.nkzawa.socketio.client.Manager.access$1000(Manager.java:20)	at com.github.nkzawa.socketio.client.Manager$2.call(Manager.java:342)	at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)	at com.github.nkzawa.engineio.client.Socket.onPacket(Socket.java:485)	at com.github.nkzawa.engineio.client.Socket.access$900(Socket.java:29)	at com.github.nkzawa.engineio.client.Socket$5.call(Socket.java:288)	at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)	at com.github.nkzawa.engineio.client.Transport.onPacket(Transport.java:121)	at com.github.nkzawa.engineio.client.Transport.onData(Transport.java:113)	at com.github.nkzawa.engineio.client.transports.WebSocket.access$100(WebSocket.java:19)	at com.github.nkzawa.engineio.client.transports.WebSocket$1$3.run(WebSocket.java:74)	at com.github.nkzawa.thread.EventThread$2.run(EventThread.java:75)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:841)