When I receive OTR message, the connection automatically closed and throw NullPointerError at org.jivesoftware.smack.util.LazyStringBuilder.length.
java.lang.NullPointerException
03-31 09:15:53.637 3588-5329/com.use.databank W/System.err: at org.jivesoftware.smack.util.LazyStringBuilder.length(LazyStringBuilder.java:72)
03-31 09:15:53.637 3588-5329/com.use.databank W/System.err: at org.jivesoftware.smack.util.XmlStringBuilder.length(XmlStringBuilder.java:329)
03-31 09:15:53.637 3588-5329/com.use.databank W/System.err: at org.jivesoftware.smack.util.LazyStringBuilder.length(LazyStringBuilder.java:72)
03-31 09:15:53.638 3588-5329/com.use.databank W/System.err: at org.jivesoftware.smack.util.LazyStringBuilder.toString(LazyStringBuilder.java:1 00)
03-31 09:15:53.638 3588-5329/com.use.databank W/System.err: at org.jivesoftware.smack.util.XmlStringBuilder.toString(XmlStringBuilder.java:344 )
03-31 09:15:53.638 3588-5329/com.use.databank W/System.err: at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter.writePackets(XMPPTCPC onnection.java:1378)
03-31 09:15:53.638 3588-5329/com.use.databank W/System.err: at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter.access$2900(XMPPTCPCo nnection.java:1180)
03-31 09:15:53.638 3588-5329/com.use.databank W/System.err: at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketWriter$1.run(XMPPTCPConnecti on.java:1228)
03-31 09:15:53.638 3588-5329/com.use.databank W/System.err: at java.lang.Thread.run(Thread.java:838)