diff --git a/third_party/blink/renderer/platform/widget/widget_base.cc b/third_party/blink/renderer/platform/widget/widget_base.cc
index cf9999d58b386..4f0013ae2a1fe 100644
--- a/third_party/blink/renderer/platform/widget/widget_base.cc
+++ b/third_party/blink/renderer/platform/widget/widget_base.cc
@@ -1518,9 +1518,15 @@ void WidgetBase::ImeSetComposition(
   }
 
   ImeEventGuard guard(weak_ptr_factory_.GetWeakPtr());
+  // SetComposition() dispatches JS events and can run a nested message loop
+  // (e.g. via window.print()) during which |this| may be destroyed.
+  base::WeakPtr<WidgetBase> weak_this = weak_ptr_factory_.GetWeakPtr();
   if (!frame_widget->SetComposition(text, ime_text_spans, replacement_range,
                                     selection_start, selection_end,
                                     ime_state)) {
+    if (!weak_this) {
+      return;
+    }
     // If we failed to set the composition text, then we need to let the browser
     // process to cancel the input method's ongoing composition session, to make
     // sure we are in a consistent state.
@@ -1529,6 +1535,9 @@ void WidgetBase::ImeSetComposition(
       host->ImeCancelComposition();
     }
   }
+  if (!weak_this) {
+    return;
+  }
   UpdateCompositionInfo(false /* not an immediate request */);
 }
 
@@ -1549,9 +1558,15 @@ void WidgetBase::ImeCommitText(const String& text,
   }
 
   ImeEventGuard guard(weak_ptr_factory_.GetWeakPtr());
+  // CommitText() dispatches JS events and can run a nested message loop during
+  // which |this| may be destroyed.
+  base::WeakPtr<WidgetBase> weak_this = weak_ptr_factory_.GetWeakPtr();
   input_handler_.set_handling_input_event(true);
   frame_widget->CommitText(text, ime_text_spans, replacement_range,
                            relative_cursor_pos);
+  if (!weak_this) {
+    return;
+  }
   input_handler_.set_handling_input_event(false);
   UpdateCompositionInfo(false /* not an immediate request */);
 }
@@ -1569,8 +1584,14 @@ void WidgetBase::ImeFinishComposingText(bool keep_selection) {
   }
 
   ImeEventGuard guard(weak_ptr_factory_.GetWeakPtr());
+  // FinishComposingText() dispatches JS events and can run a nested message
+  // loop during which |this| may be destroyed.
+  base::WeakPtr<WidgetBase> weak_this = weak_ptr_factory_.GetWeakPtr();
   input_handler_.set_handling_input_event(true);
   frame_widget->FinishComposingText(keep_selection);
+  if (!weak_this) {
+    return;
+  }
   input_handler_.set_handling_input_event(false);
   UpdateCompositionInfo(false /* not an immediate request */);
 }