diff --git a/reactos/win32ss/user/user32/windows/prop.c b/reactos/win32ss/user/user32/windows/prop.c
index 8f9b1b8c2c4..1b06d7f58bb 100644
--- a/reactos/win32ss/user/user32/windows/prop.c
+++ b/reactos/win32ss/user/user32/windows/prop.c
@@ -53,6 +53,7 @@ IntGetProp(HWND hWnd, ATOM Atom)
   for (i = 0; i < pWnd->PropListItems; i++ )
   {
       Property = CONTAINING_RECORD(ListEntry, PROPERTY, PropListEntry);
+      if (!Property) break;
       if (Property->Atom == Atom)
       {
          return(Property);