diff --git a/src/main/java/run/halo/app/config/HaloConfiguration.java b/src/main/java/run/halo/app/config/HaloConfiguration.java
index 471a667084820f464a1a5cb21429f76e929744b5..da9d4d226e30a50760ea50037d969ae246bccf0d 100644
--- a/src/main/java/run/halo/app/config/HaloConfiguration.java
+++ b/src/main/java/run/halo/app/config/HaloConfiguration.java
@@ -16,6 +16,7 @@ import run.halo.app.cache.InMemoryCacheStore;
 import run.halo.app.cache.StringCacheStore;
 import run.halo.app.config.properties.HaloProperties;
 import run.halo.app.filter.CorsFilter;
+import run.halo.app.filter.GuardFilter;
 import run.halo.app.filter.LogFilter;
 import run.halo.app.security.filter.AdminAuthenticationFilter;
 import run.halo.app.security.filter.ApiAuthenticationFilter;
@@ -75,6 +76,15 @@ public class HaloConfiguration {
         return corsFilter;
     }
 
+    @Bean
+    public FilterRegistrationBean<GuardFilter> guardFilter() {
+        FilterRegistrationBean<GuardFilter> guardFilter = new FilterRegistrationBean<>();
+        guardFilter.setOrder(Ordered.HIGHEST_PRECEDENCE);
+        guardFilter.setFilter(new GuardFilter());
+        guardFilter.addUrlPatterns("/api/*");
+        return guardFilter;
+    }
+
     /**
      * Creates a LogFilter.
      *
diff --git a/src/main/java/run/halo/app/filter/GuardFilter.java b/src/main/java/run/halo/app/filter/GuardFilter.java
new file mode 100644
index 0000000000000000000000000000000000000000..02cc4b7909b501072166453b9cc31d1b82354085
--- /dev/null
+++ b/src/main/java/run/halo/app/filter/GuardFilter.java
@@ -0,0 +1,27 @@
+package run.halo.app.filter;
+
+import org.springframework.web.filter.GenericFilterBean;
+import run.halo.app.security.context.SecurityContextHolder;
+
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import java.io.IOException;
+
+/**
+ * @author johnniang
+ * @date 19-4-30
+ */
+public class GuardFilter extends GenericFilterBean {
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+
+        // Do filter
+        chain.doFilter(request, response);
+
+        // Clear security context
+        SecurityContextHolder.clearContext();
+    }
+}
diff --git a/src/main/java/run/halo/app/service/impl/AdminServiceImpl.java b/src/main/java/run/halo/app/service/impl/AdminServiceImpl.java
index d005570a8f7140be33c41153e362030d069ca938..86e9a79cd1db05a521369e96d8fee6e47292226c 100644
--- a/src/main/java/run/halo/app/service/impl/AdminServiceImpl.java
+++ b/src/main/java/run/halo/app/service/impl/AdminServiceImpl.java
@@ -77,11 +77,6 @@ public class AdminServiceImpl implements AdminService {
     public AuthToken authenticate(LoginParam loginParam) {
         Assert.notNull(loginParam, "Login param must not be null");
 
-        if (SecurityContextHolder.getContext().isAuthenticated()) {
-            // If the user has been logged in
-            throw new BadRequestException("You have been logged in, do not log in repeatedly please");
-        }
-
         String username = loginParam.getUsername();
         User user = Validator.isEmail(username) ?
                 userService.getByEmailOfNonNull(username) : userService.getByUsernameOfNonNull(username);
@@ -93,6 +88,11 @@ public class AdminServiceImpl implements AdminService {
             throw new BadRequestException("Username or password is incorrect");
         }
 
+        if (SecurityContextHolder.getContext().isAuthenticated()) {
+            // If the user has been logged in
+            throw new BadRequestException("You have been logged in, do not log in repeatedly please");
+        }
+
         // Generate new token
         return buildAuthToken(user);
     }