diff --git a/lib/find_pkg.js b/lib/find_pkg.js
index 79fd3904..14028882 100644
--- a/lib/find_pkg.js
+++ b/lib/find_pkg.js
@@ -16,7 +16,12 @@ function checkPkg(path) {
 
   return readFile(pkgPath).then(content => {
     const json = JSON.parse(content);
-    if (typeof json.hexo === 'object') return path;
+    if (typeof json.hexo === 'object') {
+      return path
+    }
+    else {
+      throw "Can't find hexo in " + pkgPath;
+    };
   }).catch(err => {
     if (err && err.code === 'ENOENT') {
       const parent = dirname(path);