diff --git a/crypto/asn1/a_enum.c b/crypto/asn1/a_enum.c
index 34b1a38c49..53b30f2b56 100644
--- a/crypto/asn1/a_enum.c
+++ b/crypto/asn1/a_enum.c
@@ -75,6 +75,7 @@ void ASN1_ENUMERATED_free(ASN1_ENUMERATED *x)
 int i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **pp)
 {
 	int len, ret;
+	if(!a) return 0;
 	len = i2c_ASN1_INTEGER(a, NULL);	
 	ret=ASN1_object_size(0,len,V_ASN1_ENUMERATED);
 	if(pp) {
diff --git a/crypto/asn1/a_int.c b/crypto/asn1/a_int.c
index 45927ffd6e..bb8e9cf8f9 100644
--- a/crypto/asn1/a_int.c
+++ b/crypto/asn1/a_int.c
@@ -77,6 +77,7 @@ int ASN1_INTEGER_cmp(ASN1_INTEGER *x, ASN1_INTEGER *y)
 int i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
 {
 	int len, ret;
+	if(!a) return 0;
 	len = i2c_ASN1_INTEGER(a, NULL);	
 	ret=ASN1_object_size(0,len,V_ASN1_INTEGER);
 	if(pp) {