diff --git a/crypto/gmapi/gmapi_skf_ec.c b/crypto/gmapi/gmapi_skf_ec.c
index d64f0614..d82d20e0 100644
--- a/crypto/gmapi/gmapi_skf_ec.c
+++ b/crypto/gmapi/gmapi_skf_ec.c
@@ -621,6 +621,8 @@ int i2d_ECCCIPHERBLOB(ECCCIPHERBLOB *a, unsigned char **pp)
 	}
 
 	if ((ret = i2d_SM2CiphertextValue(cv, pp)) <= 0) {
+		GMAPIerr(GMAPI_F_I2D_SM2CIPHERTEXTVALUE, GMAPI_R_INVALID_SKF_CIPHERTEXT);
+		return 0;
 	}
 
 	SM2CiphertextValue_free(cv);