diff --git a/app/src/main/java/com/hippo/ehviewer/ui/scene/WebViewSignInScene.java b/app/src/main/java/com/hippo/ehviewer/ui/scene/WebViewSignInScene.java
index 1aff91ab4..d6e302c2e 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/scene/WebViewSignInScene.java
+++ b/app/src/main/java/com/hippo/ehviewer/ui/scene/WebViewSignInScene.java
@@ -18,12 +18,14 @@ package com.hippo.ehviewer.ui.scene;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.os.Build;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.webkit.CookieManager;
+import android.webkit.CookieSyncManager;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 
@@ -63,7 +65,21 @@ public class WebViewSignInScene extends BaseScene {
         AssertUtils.assertNotNull(context);
 
         EhUtils.signOut(context);
-        CookieManager.getInstance().removeAllCookie();
+
+        // http://stackoverflow.com/questions/32284642/how-to-handle-an-uncatched-exception
+        CookieManager cookieManager = CookieManager.getInstance();
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            cookieManager.flush();
+            cookieManager.removeAllCookies(null);
+            cookieManager.removeSessionCookies(null);
+        } else {
+            CookieSyncManager cookieSyncManager = CookieSyncManager.createInstance(context);
+            cookieSyncManager.startSync();
+            cookieManager.removeAllCookie();
+            cookieManager.removeSessionCookie();
+            cookieSyncManager.stopSync();
+        }
+
         mWebView = new WebView(context);
         mWebView.getSettings().setJavaScriptEnabled(true);
         mWebView.setWebViewClient(new LoginWebViewClient());