NullPointerException while parsing SDP

[hrosa]

The SDP parser throws a NullPointerException when processing the following message:
v=0
o=sbc-SMART-01a 1450021652720 1450021652720 IN IP4 203.87.254.164
s=sip call
c=IN IP4 203.87.254.172
t=0 0
m=audio 38832 RTP/AVP 8 18
a=ptime:20
a=fmtp:18 annexb=no

Here is the associated stack trace:

2015-12-13 15:41:41,270 ERROR CreateConnectionCmd Could not set remote peer
java.io.IOException: org.mobicents.media.server.io.sdp.SdpException: Could not parse SDP: a=fmtp:18 annexb=no
at org.mobicents.media.core.connections.RtpConnectionImpl.setOtherParty(RtpConnectionImpl.java:165)
at org.mobicents.media.core.connections.RtpConnectionImpl.setOtherParty(RtpConnectionImpl.java:171)
at org.mobicents.media.server.mgcp.controller.MgcpConnection.setOtherParty(MgcpConnection.java:128)
at org.mobicents.media.server.mgcp.tx.cmd.CreateConnectionCmd$Preprocessor.perform(CreateConnectionCmd.java:287)
at org.mobicents.media.server.scheduler.Task.run(Task.java:122)
at org.mobicents.media.server.scheduler.PriorityQueueScheduler$WorkerThread.run(PriorityQueueScheduler.java:424)
Caused by: org.mobicents.media.server.io.sdp.SdpException: Could not parse SDP: a=fmtp:18 annexb=no
at org.mobicents.media.server.io.sdp.SessionDescriptionParser.parse(SessionDescriptionParser.java:102)
at org.mobicents.media.core.connections.RtpConnectionImpl.setOtherParty(RtpConnectionImpl.java:161)
... 5 more
Caused by: java.lang.NullPointerException
at org.mobicents.media.server.io.sdp.SessionDescriptionParser.convertAndApplyAttribute(SessionDescriptionParser.java:155)
at org.mobicents.media.server.io.sdp.SessionDescriptionParser.parse(SessionDescriptionParser.java:88)
... 6 more
2015-12-13 15:41:41,271 ERROR MGCP tx=147483660 Failed
org.mobicents.media.server.mgcp.tx.cmd.MgcpCommandException
at org.mobicents.media.server.mgcp.tx.cmd.CreateConnectionCmd$Preprocessor.perform(CreateConnectionCmd.java:290)
at org.mobicents.media.server.scheduler.Task.run(Task.java:122)
at org.mobicents.media.server.scheduler.PriorityQueueScheduler$WorkerThread.run(PriorityQueueScheduler.java:424)