Preventing crashes when window has no PresentationSource

ControlzEx · Apr 26, 2023 · a4a57de · a4a57de
1 parent c5033fb
commit a4a57de
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/ControlzEx/Behaviors/WindowChrome/NonClientControlManager.cs b/src/ControlzEx/Behaviors/WindowChrome/NonClientControlManager.cs
@@ -131,7 +131,8 @@ public bool ClickTrackedControl(IntPtr lParam)
 
         public static DependencyObject? GetControlUnderMouse(Window owner, IntPtr lParam, out HT hitTestResult)
         {
-            if (lParam == IntPtr.Zero)
+            if (lParam == IntPtr.Zero
+                || PresentationSource.FromVisual(owner) is null)
             {
                 hitTestResult = HT.NOWHERE;
                 return null;