diff --git a/packages/runtime/src/index.ts b/packages/runtime/src/index.ts
index b09960271b..2bbbd4f7de 100644
--- a/packages/runtime/src/index.ts
+++ b/packages/runtime/src/index.ts
@@ -85,7 +85,7 @@ const plugin: NetlifyPlugin = {
 
     let usingEdge = false
 
-    if (Object.keys(middlewareManifest?.functions).length !== 0) {
+    if (middlewareManifest?.functions && Object.keys(middlewareManifest.functions).length !== 0) {
       usingEdge = true
       if (process.env.NEXT_DISABLE_NETLIFY_EDGE) {
         failBuild(outdent`
@@ -95,7 +95,7 @@ const plugin: NetlifyPlugin = {
       }
     }
 
-    if (Object.keys(middlewareManifest?.middleware).length !== 0) {
+    if (middlewareManifest?.middleware && Object.keys(middlewareManifest.middleware).length !== 0) {
       usingEdge = true
       if (process.env.NEXT_DISABLE_NETLIFY_EDGE) {
         console.log(