diff --git a/src/http/v2/ngx_http_v2_filter_module.c b/src/http/v2/ngx_http_v2_filter_module.c
index 980ea92..55e3ca9 100644
--- a/src/http/v2/ngx_http_v2_filter_module.c
+++ b/src/http/v2/ngx_http_v2_filter_module.c
@@ -946,7 +946,11 @@
 
     host = r->headers_in.host;
 
-    if (authority->len == 0 && host) {
+    if (host == NULL) {
+        return NGX_ABORT;
+    }
+
+    if (authority->len == 0) {
 
         len = 1 + NGX_HTTP_V2_INT_OCTETS + host->value.len;