diff --git a/Wox.Plugin/Query.cs b/Wox.Plugin/Query.cs
index 4289f0497d..07b640ab85 100644
--- a/Wox.Plugin/Query.cs
+++ b/Wox.Plugin/Query.cs
@@ -11,7 +11,7 @@ namespace Wox.Plugin
         /// <summary>
         /// to allow unit tests for plug ins
         /// </summary>
-        public Query(string rawQuery, string search, string[] terms, string actionKeyword = null)
+        public Query(string rawQuery, string search, string[] terms, string actionKeyword = "")
         {
             Search = search;
             RawQuery = rawQuery;
diff --git a/Wox.Plugin/Result.cs b/Wox.Plugin/Result.cs
index 88b8679f24..2f74591703 100644
--- a/Wox.Plugin/Result.cs
+++ b/Wox.Plugin/Result.cs
@@ -110,6 +110,6 @@ namespace Wox.Plugin
         /// <summary>
         /// Plugin ID that generate this result
         /// </summary>
-        public string PluginID { get; set; }
+        public string PluginID { get; internal set; }
     }
 }
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