BGP synchronization can happen after the session was closed causing conflicting modifications

2016-09-01 20:01:08,597 | INFO | entLoopGroup-8-7 | BGPSessionImpl | 307 - org.opendaylight.bgpcep.bgp-rib-impl - 0.7.0.SNAPSHOT | Closing session: BGPSessionImpl

{channel=[id: 0xa4da461a, L:/10.29.12.215:1790 - R:/10.29.12.193:17900], state=UP}

2016-09-01 20:01:08,598 | INFO | entLoopGroup-8-7 | BGPPeer | 307 - org.opendaylight.bgpcep.bgp-rib-impl - 0.7.0.SNAPSHOT | Session with peer 10.29.12.193 terminated: BGPTerminationReason

{error=WELL_KNOWN_ATTR_MISSING}

2016-09-01 20:01:08,601 | INFO | entLoopGroup-8-7 | BGPSynchronization | 307 - org.opendaylight.bgpcep.bgp-rib-impl - 0.7.0.SNAPSHOT | BGP Synchronization finished for table TablesKey [_afi=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv4AddressFamily, _safi=class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.UnicastSubsequentAddressFamily]
2016-09-01 20:01:08,602 | WARN | ult-dispatcher-4 | ShardDataTree | 200 - org.opendaylight.controller.sal-distributed-datastore - 1.5.0.SNAPSHOT | member-1-shard-default-operational: Store Tx member-1-datastore-operational-fe-0-chn-57-txn-2: Data validation failed for path /(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)bgp-rib/rib/rib[

{(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)id=example-bgp-rib}

]/peer/peer[

{(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)peer-id=bgp://10.29.12.193}

].
org.opendaylight.yangtools.yang.data.api.schema.tree.ModifiedNodeDoesNotExistException: Node /(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)bgp-rib/rib/rib[

{(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)id=example-bgp-rib}

]/peer/peer[

{(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)peer-id=bgp://10.29.12.193}

] does not exist. Cannot apply modification to its children.
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:281)[85:org.opendaylight.yangtools.yang-data-impl:1.1.0.SNAPSHOT]