public int getIpVersions(Port port) {
int versions = 0;
- for (FixedIps fixedIp: port.getFixedIps().values()) {
+ for (FixedIps fixedIp: port.nonnullFixedIps().values()) {
if (fixedIp.getIpAddress().getIpv4Address() != null) {
versions |= (1 << QosConstants.IPV4_ADDR_MASK_BIT);
} else if (fixedIp.getIpAddress().getIpv6Address() != null) {