diff --git a/racket-webview-qt.rkt b/racket-webview-qt.rkt
index d3679a3..386f404 100644
--- a/racket-webview-qt.rkt
+++ b/racket-webview-qt.rkt
@@ -836,6 +836,8 @@
                           (handle (cdr kv)))
                       (rkt-webview-close handle)))
                   open-windows)))
+    (dbg-webview "Clearing event callback function in C libary")
+    (rkt_webview_register_evt_callback #f)
     (dbg-webview "Sending guard-stop message to event callback")
     (event-callback evt-guard-stop)
     (dbg-webview "Cleaning up FFI library")