Agent crash - NULL pointer access

(gdb) bt
#0 AgentDBEntry::IsActive (this=this@entry=0x68) at controller/src/vnsw/agent/cmn/agent_db.cc:28
#1 0x0000000000d0e387 in NhDecode (nh=<optimized out>, nh@entry=0x7f29d81ff920, pkt=pkt@entry=0x7f29c0389ad0, info=info@entry=0x7f29e6400880, in=in@entry=0x7f29e6400800,
    out=out@entry=0x7f29e6400840, force_vmport=force_vmport@entry=false, ecmp_load_balance=...) at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:314
#2 0x0000000000d0e840 in NhDecode (ecmp_load_balance=..., force_vmport=false, out=0x7f29e6400840, in=0x7f29e6400800, info=0x7f29e6400880, pkt=0x7f29c0389ad0, nh=0x7f29d81ff920)
    at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:420
#3 RouteToOutInfo (rt=<optimized out>, pkt=pkt@entry=0x7f29c0389ad0, info=info@entry=0x7f29e6400880, in=in@entry=0x7f29e6400800, out=out@entry=0x7f29e6400840)
    at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:420
#4 0x0000000000d108b3 in PktFlowInfo::IngressProcess (this=this@entry=0x7f29e6400880, pkt=pkt@entry=0x7f29c0389ad0, in=in@entry=0x7f29e6400800, out=out@entry=0x7f29e6400840)
    at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:1194
#5 0x0000000000d113d5 in PktFlowInfo::Process (this=this@entry=0x7f29e6400880, pkt=0x7f29c0389ad0, in=in@entry=0x7f29e6400800, out=out@entry=0x7f29e6400840)
    at controller/src/vnsw/agent/pkt/pkt_flow_info.cc:1493
#6 0x0000000000d20962 in FlowHandler::Run (this=0x7f29c03895f0) at controller/src/vnsw/agent/pkt/flow_handler.cc:114
#7 0x0000000000d19c74 in RunProtoHandler (handler=0x7f29c03895f0, this=0x7f29e6400a60) at controller/src/vnsw/agent/pkt/proto.cc:51
#8 Proto::ProcessProto (this=this@entry=0x7f29e0af98c0, msg_info=(boost::shared_ptr<PktInfo>) (count 4, weak count 1) 0x7f29c0389ad0) at controller/src/vnsw/agent/pkt/proto.cc:66
#9 0x0000000000cfce68 in FlowProto::FlowEventHandler (this=0x7f29e0af98c0, req=0x7f29c0389c20, table=0x7f29e297cda0) at controller/src/vnsw/agent/pkt/flow_proto.cc:405
#10 0x0000000000d1dc1d in FlowEventQueueBase::Handler (this=0x7f29b8802ca0, event=0x7f29c0389c20) at controller/src/vnsw/agent/pkt/flow_event.cc:105
#11 0x0000000000d01f12 in operator() (a0=0x7f29c0389c20, this=0x7f29e6400b30) at /usr/include/boost/function/function_template.hpp:767
#12 QueueTaskRunner<FlowEvent*, WorkQueue<FlowEvent*> >::RunQueue (this=0x7f29c028e6d0) at controller/src/base/queue_task.h:92
#13 0x00000000012f3a8f in TaskImpl::execute (this=0x7f29e7da7640) at controller/src/base/task.cc:262