Merge pull request #33609 from thaJeztah/backport-29418

backport #29418 "Fix buildIpamResources()" to master

api/server/router/network/network_routes.go

@@ -410,6 +410,9 @@ func buildIpamResources(r *types.NetworkResource, nwInfo libnetwork.NetworkInfo)
 
 	if !hasIpv6Conf {
 		for _, ip6Info := range ipv6Info {
+			if ip6Info.IPAMData.Pool == nil {
+				continue
+			}
 			iData := network.IPAMConfig{}
 			iData.Subnet = ip6Info.IPAMData.Pool.String()
 			iData.Gateway = ip6Info.IPAMData.Gateway.String()