diff --git a/crypto/sm2/sm2_sign.c b/crypto/sm2/sm2_sign.c
index 09e542990bcb3e062b70f0686f3f792435fae1b6..e297353abb9413227a803b512d6426ff111cc8b8 100644
--- a/crypto/sm2/sm2_sign.c
+++ b/crypto/sm2/sm2_sign.c
@@ -210,6 +210,10 @@ static ECDSA_SIG *sm2_sig_gen(const EC_KEY *key, const BIGNUM *e)
     BIGNUM *tmp = NULL;
     OSSL_LIB_CTX *libctx = ossl_ec_key_get_libctx(key);
 
+    if (dA == NULL) {
+        ERR_raise(ERR_LIB_SM2, SM2_R_INVALID_PRIVATE_KEY);
+        goto done;
+    }
     kG = EC_POINT_new(group);
     ctx = BN_CTX_new_ex(libctx);
     if (kG == NULL || ctx == NULL) {