Ja.

rktwebview.cpp

@@ -242,8 +242,8 @@ void rkt_evt_guard(void)
                 INFO2("Got event wv = %d, %s\n", wv, data.c_str());
             }
             if (wv != EVT_GUARD_STOP) {
-                if (handler->evt_cb != nullptr) {       // evt_cb could be cleared to null
                 handler->evt_queue->enqueue(wv, data);
+                if (handler->evt_cb != nullptr) {       // evt_cb could be cleared to null
                     INFO2("Calling evt_cb with %d, %s\n", wv, data.c_str());
                     handler->evt_cb(1);
                     INFO0("done\n");
@@ -300,6 +300,7 @@ void rkt_webview_cleanup()
         // QtWebEngine cannot be started as part of QApplication more than once in an application run.
         // So we would need to cleanup at exit of racket/drracket.
         // Cleaning up when exiting the current custodian is not enough.
+        INFO0("rkt_webview_cleanup - cleaning up\n");
 
         handler->verbose = true;
 
@@ -360,6 +361,8 @@ void rkt_webview_cleanup()
         // Cleanup Handler
         delete handler;
         handler = nullptr;
+    } else {
+        WARN0("rkt_webview_cleanup called, but handler == null\n");
     }
 }