diff --git a/contrib/pgcrypto/px.c b/contrib/pgcrypto/px.c
index aea8e863af..f26683aa11 100644
--- a/contrib/pgcrypto/px.c
+++ b/contrib/pgcrypto/px.c
@@ -300,6 +300,7 @@ static int
 combo_decrypt(PX_Combo *cx, const uint8 *data, unsigned dlen,
 			  uint8 *res, unsigned *rlen)
 {
+	int			err = 0;
 	unsigned	bs,
 				i,
 				pad;
@@ -325,7 +326,9 @@ combo_decrypt(PX_Combo *cx, const uint8 *data, unsigned dlen,
 
 	/* decrypt */
 	*rlen = dlen;
-	px_cipher_decrypt(c, data, dlen, res);
+	err = px_cipher_decrypt(c, data, dlen, res);
+	if (err)
+		return err;
 
 	/* unpad */
 	if (bs > 1 && cx->padding)