Merge pull request #29418 from aboch/p66

[1.13.x] Fix buildIpamResources()
(cherry picked from commit 4d2be03b68dd54d8f2307e8b4178ad8ed8d5d343)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 27498a3)
Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>

components/engine/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()