java.lang.NullPointerException: This exception has no message.

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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.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$1200(Manager.java:20)
at com.github.nkzawa.emitter.Emitter.emit(Emitter.java:117)
at com.github.nkzawa.socketio.parser.Parser$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.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)

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