diff --git a/tls.c b/tls.c
index 3eec1f9..970584b 100644
--- a/tls.c
+++ b/tls.c
@@ -159,7 +159,8 @@ parse_tls_header(const struct TLSProtocol *tls_data, const char *data, size_t da
 
     /* By now we know it's TLS. if SNI or ALPN is set, parse extensions to see if
      * they match. Otherwise, it's a match already */
-    if (tls_data->match_mode.tls_match_alpn || tls_data->match_mode.tls_match_sni) {
+    if (tls_data && 
+        (tls_data->match_mode.tls_match_alpn || tls_data->match_mode.tls_match_sni)) {
         return parse_extensions(tls_data, data + pos, len);
     } else {
         return 1;