diff --git a/src/base/AFPluginManager.hpp b/src/base/AFPluginManager.hpp
index 3d6130c3..e31459fd 100755
--- a/src/base/AFPluginManager.hpp
+++ b/src/base/AFPluginManager.hpp
@@ -197,7 +197,7 @@ class AFPluginManager final : public AFSingleton<AFPluginManager>
     {
         std::string plugin_name = plugin->GetPluginName();
 
-        ARK_ASSERT_RET_NONE(FindPlugin(plugin_name) == false);
+        ARK_ASSERT_RET_NONE(FindPlugin(plugin_name) == nullptr);
         plugin->SetPluginManager(this);
         plugin_instances_.insert(plugin_name, plugin);
         plugin->Install();