diff --git a/pkg/discoveryregistry/zookeeper/discover.go b/pkg/discoveryregistry/zookeeper/discover.go
index 01900e08e..3f5a5df42 100644
--- a/pkg/discoveryregistry/zookeeper/discover.go
+++ b/pkg/discoveryregistry/zookeeper/discover.go
@@ -107,7 +107,7 @@ func (s *ZkClient) GetConn(ctx context.Context, serviceName string, opts ...grpc
 	if len(conns) == 0 {
 		return nil, ErrConnIsNil
 	}
-	return s.getConnBalance(conns), nil
+	return s.getConnBalance(conns)
 }
 
 func (s *ZkClient) GetFirstConn(ctx context.Context, serviceName string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
diff --git a/pkg/discoveryregistry/zookeeper/load_balancing.go b/pkg/discoveryregistry/zookeeper/load_balancing.go
index c20639d31..2fee4aa66 100644
--- a/pkg/discoveryregistry/zookeeper/load_balancing.go
+++ b/pkg/discoveryregistry/zookeeper/load_balancing.go
@@ -11,7 +11,10 @@ type RoundRobin struct {
 	lock  sync.Mutex
 }
 
-func (r *RoundRobin) getConnBalance(conns []*grpc.ClientConn) (conn *grpc.ClientConn) {
+func (r *RoundRobin) getConnBalance(conns []*grpc.ClientConn) (conn *grpc.ClientConn, err error) {
+	if len(conns) == 0 {
+		return nil, ErrConnIsNil
+	}
 	r.lock.Lock()
 	defer r.lock.Unlock()
 	if r.index < len(conns)-1 {
@@ -19,5 +22,5 @@ func (r *RoundRobin) getConnBalance(conns []*grpc.ClientConn) (conn *grpc.Client
 	} else {
 		r.index = 0
 	}
-	return conns[r.index]
+	return conns[r.index], nil
 }