diff --git a/lib/Server.js b/lib/Server.js
index 64d64255e2..926f137fe9 100644
--- a/lib/Server.js
+++ b/lib/Server.js
@@ -1973,15 +1973,29 @@ class Server {
 
         let isOutputModule = false;
 
-        this.stats.compilation.assetsInfo.forEach((value, key) => {
-          const assetExtension = path.extname(key);
-          const assetBasename = path.basename(key, assetExtension);
+        if (typeof this.compiler.compilers !== "undefined") {
+          this.stats.stats.forEach((stats) => {
+            stats.compilation.assetsInfo.forEach((value, key) => {
+              const assetExtension = path.extname(key);
+              const assetBasename = path.basename(key, assetExtension);
+
+              if (assetBasename === outputFilename) {
+                extension = assetExtension;
+                isOutputModule = value.javascriptModule;
+              }
+            });
+          });
+        } else {
+          this.stats.compilation.assetsInfo.forEach((value, key) => {
+            const assetExtension = path.extname(key);
+            const assetBasename = path.basename(key, assetExtension);
 
-          if (assetBasename === outputFilename) {
-            extension = assetExtension;
-            isOutputModule = value.javascriptModule;
-          }
-        });
+            if (assetBasename === outputFilename) {
+              extension = assetExtension;
+              isOutputModule = value.javascriptModule;
+            }
+          });
+        }
 
         if (isOutputModule) {
           filename = this.middleware.getFilenameFromUrl(`${_path}${extension}`);
@@ -2006,6 +2020,7 @@ class Server {
 
         res.send(responsePage);
       } catch (error) {
+        console.log(error);
         return next();
       }
     });