NPE in DHCP during IP renew when no IP range is registered

DHCP throws NPE during IP renew when no IP range is registered and use the service only for "rangeNotEnforced" static mapping. Even if I add default service range, no NPE but DHCP ACK is not generated for rangeNotForced IP.

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2015-12-07 19:03:27,313 | WARN | ew I/O worker #1 | PacketManager | 143 - org.onosproject.onos-core-net - 1.4.0.SNAPSHOT | Packet processor org.onosproject.dhcp.impl.DhcpManager$DhcpPacketProcessor@76ac3cde threw an exception
java.lang.NullPointerException
at org.onosproject.dhcp.impl.DistributedDhcpStore.ipWithinRange(DistributedDhcpStore.java:358)[185:org.onosproject.onos-app-dhcp:1.4.0.SNAPSHOT]
at org.onosproject.dhcp.impl.DistributedDhcpStore.assignIP(DistributedDhcpStore.java:178)[185:org.onosproject.onos-app-dhcp:1.4.0.SNAPSHOT]
at org.onosproject.dhcp.impl.DhcpManager$DhcpPacketProcessor.processDhcpPacket(DhcpManager.java:520)[185:org.onosproject.onos-app-dhcp:1.4.0.SNAPSHOT]
at org.onosproject.dhcp.impl.DhcpManager$DhcpPacketProcessor.process(DhcpManager.java:609)[185:org.onosproject.onos-app-dhcp:1.4.0.SNAPSHOT]
at org.onosproject.net.packet.impl.PacketManager$InternalPacketProviderService.processPacket(PacketManager.java:317)[143:org.onosproject.onos-core-net:1.4.0.SNAPSHOT]
at org.onosproject.provider.of.packet.impl.OpenFlowPacketProvider$InternalPacketProvider.handlePacket(OpenFlowPacketProvider.java:170)[172:org.onosproject.onos-of-provider-packet:1.4.0.SNAPSHOT]