diff --git a/libnetwork/resolver.go b/libnetwork/resolver.go
index e32522a254..bc8b964cdf 100644
--- a/libnetwork/resolver.go
+++ b/libnetwork/resolver.go
@@ -484,7 +484,7 @@ func (r *resolver) ServeDNS(w dns.ResponseWriter, query *dns.Msg) {
 			resp, err = co.ReadMsg()
 			// Truncated DNS replies should be sent to the client so that the
 			// client can retry over TCP
-			if err != nil && (resp != nil && !resp.Truncated) {
+			if err != nil && (resp == nil || !resp.Truncated) {
 				r.forwardQueryEnd()
 				logrus.Debugf("[resolver] read from DNS server failed, %s", err)
 				continue