diff --git a/engine/src/flutter/lib/web_ui/lib/src/engine/keyboard_binding.dart b/engine/src/flutter/lib/web_ui/lib/src/engine/keyboard_binding.dart
index 3c10d09a481..4567f414fb6 100644
--- a/engine/src/flutter/lib/web_ui/lib/src/engine/keyboard_binding.dart
+++ b/engine/src/flutter/lib/web_ui/lib/src/engine/keyboard_binding.dart
@@ -586,6 +586,11 @@ class KeyboardConverter {
   //  * Some key data might be synthesized to update states after the main key
   //    data. They are always scheduled asynchronously with results discarded.
   void handleEvent(FlutterHtmlKeyboardEvent event) {
+    // Autofill on Chrome sends keyboard events whose key and code are null.
+    if (event.key == null || event.code == null) {
+      return;
+    }
+
     assert(_dispatchKeyData == null);
     bool sentAnyEvents = false;
     _dispatchKeyData = (ui.KeyData data) {
diff --git a/engine/src/flutter/lib/web_ui/test/engine/keyboard_converter_test.dart b/engine/src/flutter/lib/web_ui/test/engine/keyboard_converter_test.dart
index d381393fa89..dab4914f64f 100644
--- a/engine/src/flutter/lib/web_ui/test/engine/keyboard_converter_test.dart
+++ b/engine/src/flutter/lib/web_ui/test/engine/keyboard_converter_test.dart
@@ -1142,6 +1142,21 @@ void testMain() {
     );
     keyDataList.clear();
   });
+
+  test('Ignore DOM event when event.key is null', () {
+    // Regression test for https://github.com/flutter/flutter/issues/114620.
+    final List<ui.KeyData> keyDataList = <ui.KeyData>[];
+    final KeyboardConverter converter = KeyboardConverter((ui.KeyData key) {
+      keyDataList.add(key);
+      return true;
+    }, OperatingSystem.linux);
+
+    converter.handleEvent(keyDownEvent(null, null));
+    converter.handleEvent(keyUpEvent(null, null));
+
+    // Invalid key events are ignored.
+    expect(keyDataList, isEmpty);
+  });
 }
 
 // Flags used for the `modifiers` argument of `key***Event` functions.
@@ -1153,7 +1168,7 @@ const int kMeta = 0x8;
 // Utility functions to make code more concise.
 //
 // To add timeStamp , use syntax `..timeStamp = `.
-MockKeyboardEvent keyDownEvent(String code, String key, [int modifiers = 0, int location = 0]) {
+MockKeyboardEvent keyDownEvent(String? code, String? key, [int modifiers = 0, int location = 0]) {
   return MockKeyboardEvent(
     type: 'keydown',
     code: code,
@@ -1166,7 +1181,7 @@ MockKeyboardEvent keyDownEvent(String code, String key, [int modifiers = 0, int
   );
 }
 
-MockKeyboardEvent keyUpEvent(String code, String key, [int modifiers = 0, int location = 0]) {
+MockKeyboardEvent keyUpEvent(String? code, String? key, [int modifiers = 0, int location = 0]) {
   return MockKeyboardEvent(
     type: 'keyup',
     code: code,