diff --git a/Plugins/Wox.Plugin.WebSearch/Main.cs b/Plugins/Wox.Plugin.WebSearch/Main.cs
index 27c04952e1..2d565ed2f6 100644
--- a/Plugins/Wox.Plugin.WebSearch/Main.cs
+++ b/Plugins/Wox.Plugin.WebSearch/Main.cs
@@ -69,7 +69,7 @@ namespace Wox.Plugin.WebSearch
                     };
 
                     results.Add(result);
-                    ResultsUpdated.Invoke(this, new ResultUpdatedEventArgs
+                    ResultsUpdated?.Invoke(this, new ResultUpdatedEventArgs
                     {
                         Results = results,
                         Query = query
@@ -167,4 +167,4 @@ namespace Wox.Plugin.WebSearch
 
         public event ResultUpdatedEventHandler ResultsUpdated;
     }
-}
\ No newline at end of file
+}