diff --git a/lib/plugin-loader.js b/lib/plugin-loader.js
index 17d84203c..5e54110dd 100644
--- a/lib/plugin-loader.js
+++ b/lib/plugin-loader.js
@@ -22,7 +22,7 @@ function load_plugins(config, plugin_configs, params, sanity_check) {
     if (plugin === null && p.match(/^[^\.\/]/)) {
       plugin = try_load('verdaccio-' + p)
       // compatibility for old sinopia plugins
-      if(!plugin) {
+      if (!plugin) {
         plugin = try_load('sinopia-' + p)
       }
     }
@@ -37,18 +37,18 @@ function load_plugins(config, plugin_configs, params, sanity_check) {
     }
 
     if (plugin === null) {
-      throw Error('"' + p + '" plugin not found\ntry "npm install verdaccio-' + p + '"')
+      throw new Error('"' + p + '" plugin not found\ntry "npm install verdaccio-' + p + '"')
     }
 
     if (typeof(plugin) !== 'function')
-      throw Error('"' + p + '" doesn\'t look like a valid plugin')
+      throw new Error('"' + p + '" doesn\'t look like a valid plugin')
 
     plugin = plugin(plugin_configs[p], params)
 
     if (plugin === null || !sanity_check(plugin))
-      throw Error('"' + p + '" doesn\'t look like a valid plugin')
+      throw new Error('"' + p + '" doesn\'t look like a valid plugin')
 
-    return plugin
+    return plugin;
   })
 
   return plugins
diff --git a/test/unit/plugin_loader.js b/test/unit/plugin_loader.js
index 6c6b3a3a1..4bca68f59 100644
--- a/test/unit/plugin_loader.js
+++ b/test/unit/plugin_loader.js
@@ -54,6 +54,7 @@ describe('plugin loader', function() {
 
 	it('testing auth plugin no plugins', function() {
 		let _config = {
+			self_path: path.join(__dirname, './'),
 			auth: {
 				'./unit/partials/test-plugin-storage/invalid-package': {}
 			}