diff --git a/patch/patch.cfg b/patch/patch.cfg
index da7a7d06c..3a8fc7b97 100644
--- a/patch/patch.cfg
+++ b/patch/patch.cfg
@@ -270,6 +270,9 @@ patches = [
     # Fix usage of JavaScript tab modal dialogs with Alloy style browsers.
     # Modifies the logic added in https://crrev.com/78ce55cbc0.
     # https://github.com/chromiumembedded/cef/issues/3818
+    #
+    # Fix crash with OSR browsers on Linux.
+    # https://github.com/chromiumembedded/cef/issues/3921
     'name': 'chrome_browser_dialogs_jsmodal',
   },
   {
diff --git a/patch/patches/chrome_browser_dialogs_jsmodal.patch b/patch/patches/chrome_browser_dialogs_jsmodal.patch
index 9dd0cd610..07ce74f77 100644
--- a/patch/patches/chrome_browser_dialogs_jsmodal.patch
+++ b/patch/patches/chrome_browser_dialogs_jsmodal.patch
@@ -57,10 +57,27 @@ index 8c06a19a64e5d..2b9429f7b2bab 100644
  }
  
 diff --git chrome/browser/ui/views/javascript_tab_modal_dialog_view_views.cc chrome/browser/ui/views/javascript_tab_modal_dialog_view_views.cc
-index e0c7c6df6f415..171f042d712e4 100644
+index e0c7c6df6f415..106cf8d8b998a 100644
 --- chrome/browser/ui/views/javascript_tab_modal_dialog_view_views.cc
 +++ chrome/browser/ui/views/javascript_tab_modal_dialog_view_views.cc
-@@ -79,10 +79,13 @@ JavaScriptTabModalDialogViewViews::JavaScriptTabModalDialogViewViews(
+@@ -49,9 +49,13 @@ views::View* JavaScriptTabModalDialogViewViews::GetInitiallyFocusedView() {
+ }
+ 
+ void JavaScriptTabModalDialogViewViews::AddedToWidget() {
+-  auto* bubble_frame_view = static_cast<views::BubbleFrameView*>(
+-      GetWidget()->non_client_view()->frame_view());
+-  bubble_frame_view->SetTitleView(CreateTitleOriginLabel(GetWindowTitle()));
++  auto* frame_view = GetWidget()->non_client_view()->frame_view();
++  // With CEF OSR this may be a NativeFrameView, in which case HasWindowTitle()
++  // will return false.
++  if (frame_view->HasWindowTitle()) {
++    auto* bubble_frame_view = static_cast<views::BubbleFrameView*>(frame_view);
++    bubble_frame_view->SetTitleView(CreateTitleOriginLabel(GetWindowTitle()));
++  }
+   if (!message_text_.empty()) {
+     GetWidget()->GetRootView()->GetViewAccessibility().SetDescription(
+         message_text_);
+@@ -79,10 +83,13 @@ JavaScriptTabModalDialogViewViews::JavaScriptTabModalDialogViewViews(
        default_prompt_text_(default_prompt_text),
        dialog_callback_(std::move(dialog_callback)),
        dialog_force_closed_callback_(std::move(dialog_force_closed_callback)) {