diff --git a/src/ngx_stream_lua_sleep.c b/src/ngx_stream_lua_sleep.c
index 060eccf2..88b5cca2 100644
--- a/src/ngx_stream_lua_sleep.c
+++ b/src/ngx_stream_lua_sleep.c
@@ -102,6 +102,14 @@ void
 ngx_stream_lua_sleep_handler(ngx_event_t *ev)
 {
 
+#if (NGX_DEBUG)
+
+
+    ngx_connection_t        *c;
+
+
+#endif
+
 
     ngx_stream_lua_request_t      *r;
     ngx_stream_lua_ctx_t      *ctx;
@@ -115,6 +123,14 @@ ngx_stream_lua_sleep_handler(ngx_event_t *ev)
     r = coctx->data;
 
 
+#if (NGX_DEBUG)
+
+
+    c = r->connection;
+
+
+#endif
+
 
     ctx = ngx_stream_lua_get_module_ctx(r, ngx_stream_lua_module);
 
diff --git a/src/ngx_stream_lua_socket_tcp.c b/src/ngx_stream_lua_socket_tcp.c
index c861048b..a42e1e24 100644
--- a/src/ngx_stream_lua_socket_tcp.c
+++ b/src/ngx_stream_lua_socket_tcp.c
@@ -780,6 +780,14 @@ ngx_stream_lua_socket_resolve_handler(ngx_resolver_ctx_t *ctx)
     ngx_stream_lua_request_t                      *r;
 
 
+#if (NGX_DEBUG)
+
+
+    ngx_connection_t                    *c;
+
+
+#endif
+
 
     ngx_stream_upstream_resolved_t        *ur;
     ngx_stream_lua_ctx_t                  *lctx;
@@ -800,6 +808,14 @@ ngx_stream_lua_socket_resolve_handler(ngx_resolver_ctx_t *ctx)
     r = u->request;
 
 
+#if (NGX_DEBUG)
+
+
+    c = r->connection;
+
+
+#endif
+
 
     ur = u->resolved;
 
diff --git a/src/ngx_stream_lua_socket_udp.c b/src/ngx_stream_lua_socket_udp.c
index 6723da40..925764a0 100644
--- a/src/ngx_stream_lua_socket_udp.c
+++ b/src/ngx_stream_lua_socket_udp.c
@@ -429,6 +429,14 @@ ngx_stream_lua_socket_resolve_handler(ngx_resolver_ctx_t *ctx)
     ngx_stream_lua_request_t                      *r;
 
 
+#if (NGX_DEBUG)
+
+
+    ngx_connection_t                    *c;
+
+
+#endif
+
 
     ngx_stream_upstream_resolved_t        *ur;
     ngx_stream_lua_ctx_t                  *lctx;
@@ -449,6 +457,14 @@ ngx_stream_lua_socket_resolve_handler(ngx_resolver_ctx_t *ctx)
     r = u->request;
 
 
+#if (NGX_DEBUG)
+
+
+    c = r->connection;
+
+
+#endif
+
 
     ur = u->resolved;