diff --git a/src/x509.c b/src/x509.c
index 6c9c769cd..43386dc8a 100644
--- a/src/x509.c
+++ b/src/x509.c
@@ -8236,7 +8236,8 @@ int wolfSSL_X509_CRL_get_signature(WOLFSSL_X509_CRL* crl,
 {
     WOLFSSL_ENTER("wolfSSL_X509_CRL_get_signature");
 
-    if (crl == NULL || crl->crlList == NULL || bufSz == NULL)
+    if (crl == NULL || crl->crlList == NULL ||
+        crl->crlList->signature == NULL || bufSz == NULL)
         return BAD_FUNC_ARG;
 
     if (buf != NULL)