diff --git a/src/http/ngx_http_spdy.c b/src/http/ngx_http_spdy.c
index 8bce18e..e53e3aa 100644
--- a/src/http/ngx_http_spdy.c
+++ b/src/http/ngx_http_spdy.c
@@ -1944,6 +1944,7 @@
         ngx_log_error(NGX_LOG_ALERT, sc->connection->log, 0,
                       "state buffer overflow: %uz bytes required", size);
 
+        ngx_debug_point();
         return ngx_http_spdy_state_internal_error(sc);
     }