From 9830ee44cbbe24740fda4a6801e9268092f702aa Mon Sep 17 00:00:00 2001
From: Shigma <1700011071@pku.edu.cn>
Date: Wed, 3 Apr 2019 20:16:41 +0800
Subject: [PATCH 1/2] Update util.js

---
 packages/@vuepress/core/lib/node/plugin-api/util.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/packages/@vuepress/core/lib/node/plugin-api/util.js b/packages/@vuepress/core/lib/node/plugin-api/util.js
index a0d7be90ed..6741638b99 100644
--- a/packages/@vuepress/core/lib/node/plugin-api/util.js
+++ b/packages/@vuepress/core/lib/node/plugin-api/util.js
@@ -43,6 +43,14 @@ exports.flattenPlugin = function (
     // 'Object.create' here is to give each plugin a separate context,
     // but also own the inheritance context.
     config = config(pluginOptions, Object.create(pluginContext), self)
+    const { valid, warnMsg } = assertTypes(config, [Object])
+    if (!valid) {
+      logger.warn(
+        `[${chalk.gray(shortcut)}] `
+        + `Invalid value for plugin: ${warnMsg}`
+      )
+    }
+    config = {}
   }
 
   // respect name in local plugin config

From 0a2e4b1c79080173eda8c45330436894f9cd7b78 Mon Sep 17 00:00:00 2001
From: Shigma <1700011071@pku.edu.cn>
Date: Wed, 3 Apr 2019 20:24:15 +0800
Subject: [PATCH 2/2] Update util.js

---
 packages/@vuepress/core/lib/node/plugin-api/util.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/@vuepress/core/lib/node/plugin-api/util.js b/packages/@vuepress/core/lib/node/plugin-api/util.js
index 6741638b99..b3c17a5025 100644
--- a/packages/@vuepress/core/lib/node/plugin-api/util.js
+++ b/packages/@vuepress/core/lib/node/plugin-api/util.js
@@ -49,8 +49,8 @@ exports.flattenPlugin = function (
         `[${chalk.gray(shortcut)}] `
         + `Invalid value for plugin: ${warnMsg}`
       )
+      config = {}
     }
-    config = {}
   }
 
   // respect name in local plugin config