diff --git a/fxjs/xfa/cjx_hostpseudomodel.cpp b/fxjs/xfa/cjx_hostpseudomodel.cpp
index 2437a30..0cfffa6 100644
--- a/fxjs/xfa/cjx_hostpseudomodel.cpp
+++ b/fxjs/xfa/cjx_hostpseudomodel.cpp
@@ -310,8 +310,13 @@
   if (!hWidget)
     return CJS_Result::Success();
 
+  // SetFocusWidget() may destroy |hWidget| object by JS callback.
+  ObservedPtr<CXFA_FFWidget> pObservedWidget(hWidget);
   CXFA_FFDoc* hDoc = pNotify->GetHDOC();
   hDoc->GetDocEnvironment()->SetFocusWidget(hDoc, hWidget);
+  if (!pObservedWidget)
+    return CJS_Result::Success();
+
   pNotify->OpenDropDownList(hWidget);
   return CJS_Result::Success();
 }