diff --git a/crypto/ecies/ecies.go b/crypto/ecies/ecies.go
index 593f1bd622..8def7bed90 100644
--- a/crypto/ecies/ecies.go
+++ b/crypto/ecies/ecies.go
@@ -124,6 +124,9 @@ func (prv *PrivateKey) GenerateShared(pub *PublicKey, skLen, macLen int) (sk []b
 	if prv.PublicKey.Curve != pub.Curve {
 		return nil, ErrInvalidCurve
 	}
+	if pub.X == nil || pub.Y == nil || !pub.Curve.IsOnCurve(pub.X, pub.Y) {
+		return nil, ErrInvalidPublicKey
+	}
 	if skLen+macLen > MaxSharedKeyLength(pub) {
 		return nil, ErrSharedKeyTooBig
 	}