diff --git a/flow-server/src/main/java/com/vaadin/flow/server/communication/IndexHtmlRequestHandler.java b/flow-server/src/main/java/com/vaadin/flow/server/communication/IndexHtmlRequestHandler.java
index e33908e7485..bba841b87c8 100644
--- a/flow-server/src/main/java/com/vaadin/flow/server/communication/IndexHtmlRequestHandler.java
+++ b/flow-server/src/main/java/com/vaadin/flow/server/communication/IndexHtmlRequestHandler.java
@@ -219,23 +219,31 @@ public boolean synchronizedHandleRequest(VaadinSession session,
     private void initializeFeatureFlags(Document indexDocument,
             VaadinRequest request) {
         String script = featureFlagsInitializer(request);
+        if (script.isEmpty()) {
+            return;
+        }
         Element scriptElement = indexDocument.head().prependElement("script");
         scriptElement.attr(SCRIPT_INITIAL, "");
         scriptElement.appendChild(new DataNode(script));
     }
 
     static String featureFlagsInitializer(VaadinRequest request) {
-        return FeatureFlags.get(request.getService().getContext()).getFeatures()
-                .stream().filter(Feature::isEnabled)
-                .map(feature -> String.format("activator(\"%s\");",
-                        feature.getId()))
-                .collect(Collectors.joining("\n",
-                        """
-                                window.Vaadin = window.Vaadin || {};
-                                window.Vaadin.featureFlagsUpdaters = window.Vaadin.featureFlagsUpdaters || [];
-                                window.Vaadin.featureFlagsUpdaters.push((activator) => {
-                                """,
-                        "});"));
+        String activations = FeatureFlags
+                .get(request.getService().getContext()).getFeatures().stream()
+                .filter(Feature::isEnabled).map(feature -> String
+                        .format("activator(\"%s\");", feature.getId()))
+                .collect(Collectors.joining("\n"));
+
+        if (activations.isEmpty()) {
+            return "";
+        }
+
+        return """
+                window.Vaadin = window.Vaadin || {};
+                window.Vaadin.featureFlagsUpdaters = window.Vaadin.featureFlagsUpdaters || [];
+                window.Vaadin.featureFlagsUpdaters.push((activator) => {
+                """
+                + activations + "\n});";
     }
 
     private static void addDevBundleTheme(Document document,
diff --git a/flow-server/src/test/java/com/vaadin/flow/server/communication/IndexHtmlRequestHandlerTest.java b/flow-server/src/test/java/com/vaadin/flow/server/communication/IndexHtmlRequestHandlerTest.java
index 86c5dfff8cc..2b32a0b1ed6 100644
--- a/flow-server/src/test/java/com/vaadin/flow/server/communication/IndexHtmlRequestHandlerTest.java
+++ b/flow-server/src/test/java/com/vaadin/flow/server/communication/IndexHtmlRequestHandlerTest.java
@@ -218,9 +218,9 @@ public void serveIndexHtml_featureFlagsSetter_isPresent()
         indexHtmlRequestHandler.synchronizedHandleRequest(session,
                 createVaadinRequest("/"), response);
         String indexHtml = responseOutput.toString(StandardCharsets.UTF_8);
-        assertTrue(indexHtml.contains(
+        assertFalse(indexHtml.contains(
                 "window.Vaadin.featureFlagsUpdaters.push((activator) => {"),
-                "Response should have Feature Flags updater function");
+                "Response should not have Feature Flags updater function when no flags are enabled");
     }
 
     @Test
diff --git a/flow-server/src/test/java/com/vaadin/flow/server/communication/WebComponentProviderTest.java b/flow-server/src/test/java/com/vaadin/flow/server/communication/WebComponentProviderTest.java
index d9d0745a21d..cfa2e6bdf1e 100644
--- a/flow-server/src/test/java/com/vaadin/flow/server/communication/WebComponentProviderTest.java
+++ b/flow-server/src/test/java/com/vaadin/flow/server/communication/WebComponentProviderTest.java
@@ -209,9 +209,9 @@ void webComponentGenerator_responseGetsResult() throws IOException {
                 provider.synchronizedHandleRequest(session, request, response),
                 "Provider should handle web-component request");
 
-        assertTrue(out.toString().contains(
+        assertFalse(out.toString().contains(
                 "window.Vaadin.featureFlagsUpdaters.push((activator) => {"),
-                "Response should have Feature Flags updater function");
+                "Response should not have Feature Flags updater function when no flags are enabled");
 
         Mockito.verify(response).getOutputStream();
         Mockito.verify(out).write(Mockito.any(), Mockito.anyInt(),