diff --git a/Wox/ViewModel/MainViewModel.cs b/Wox/ViewModel/MainViewModel.cs
index cd2214a69a..780c6d6e91 100644
--- a/Wox/ViewModel/MainViewModel.cs
+++ b/Wox/ViewModel/MainViewModel.cs
@@ -184,7 +184,7 @@ namespace Wox.ViewModel
                 var result = results.SelectedItem?.RawResult;
                 if (result != null) // SelectedItem returns null if selection is empty.
                 {
-                    bool hideWindow = result.Action(new ActionContext
+                    bool hideWindow = result.Action != null && result.Action(new ActionContext
                     {
                         SpecialKeyState = GlobalHotkey.Instance.CheckModifiers()
                     });