diff --git a/bin/helpers/merge.ts b/bin/helpers/merge.ts
index 5645383..1adcb64 100644
--- a/bin/helpers/merge.ts
+++ b/bin/helpers/merge.ts
@@ -302,13 +302,15 @@ StartupNotify=true
 
   // inject js or css files
   if (inject?.length > 0) {
+    // Ensure inject is an array before calling .every()
+    const injectArray = Array.isArray(inject) ? inject : [inject];
     if (
-      !inject.every((item) => item.endsWith('.css') || item.endsWith('.js'))
+      !injectArray.every((item) => item.endsWith('.css') || item.endsWith('.js'))
     ) {
       logger.error('The injected file must be in either CSS or JS format.');
       return;
     }
-    const files = inject.map((filepath) =>
+    const files = injectArray.map((filepath) =>
       path.isAbsolute(filepath) ? filepath : path.join(process.cwd(), filepath),
     );
     tauriConf.pake.inject = files;
diff --git a/dist/cli.js b/dist/cli.js
index 61aef9e..83a5573 100755
--- a/dist/cli.js
+++ b/dist/cli.js
@@ -548,11 +548,13 @@ StartupNotify=true
     const injectFilePath = path.join(npmDirectory, `src-tauri/src/inject/custom.js`);
     // inject js or css files
     if (inject?.length > 0) {
-        if (!inject.every((item) => item.endsWith('.css') || item.endsWith('.js'))) {
+        // Ensure inject is an array before calling .every()
+        const injectArray = Array.isArray(inject) ? inject : [inject];
+        if (!injectArray.every((item) => item.endsWith('.css') || item.endsWith('.js'))) {
             logger.error('The injected file must be in either CSS or JS format.');
             return;
         }
-        const files = inject.map((filepath) => path.isAbsolute(filepath) ? filepath : path.join(process.cwd(), filepath));
+        const files = injectArray.map((filepath) => path.isAbsolute(filepath) ? filepath : path.join(process.cwd(), filepath));
         tauriConf.pake.inject = files;
         await combineFiles(files, injectFilePath);
     }