diff --git a/packages/react-dom/src/server/ReactDOMServerFormatConfig.js b/packages/react-dom/src/server/ReactDOMServerFormatConfig.js
index 4db5773945a94..1c65ae1420bfd 100644
--- a/packages/react-dom/src/server/ReactDOMServerFormatConfig.js
+++ b/packages/react-dom/src/server/ReactDOMServerFormatConfig.js
@@ -1128,7 +1128,6 @@ function pushStartTitle(
   target.push(startChunkForTag('title'));
 
   let children = null;
-  let innerHTML = null;
   for (const propKey in props) {
     if (hasOwnProperty.call(props, propKey)) {
       const propValue = props[propKey];
@@ -1153,7 +1152,7 @@ function pushStartTitle(
   target.push(endOfStartTag);
 
   if (__DEV__) {
-    let child =
+    const child =
       Array.isArray(children) && children.length < 2
         ? children[0] || null
         : children;
diff --git a/scripts/error-codes/codes.json b/scripts/error-codes/codes.json
index a8c8810bbe49e..832cc8712fdbc 100644
--- a/scripts/error-codes/codes.json
+++ b/scripts/error-codes/codes.json
@@ -418,5 +418,6 @@
   "430": "ServerContext can only have a value prop and children. Found: %s",
   "431": "React elements are not allowed in ServerContext",
   "432": "This Suspense boundary was aborted by the server",
-  "433": "useId can only be used while React is rendering"
+  "433": "useId can only be used while React is rendering",
+  "434": "`dangerouslySetInnerHTML` does not make sense on <title>."
 }