win32: Don't dereference keyboard_grab if it is NULL

This fixes a crash in e.g. testdnd

diff --git a/gdk/win32/gdkevents-win32.c b/gdk/win32/gdkevents-win32.c
index 16d81956eb611da39efaa2409d6bbb9c70852bf8..83adae67a8c7758e385389cd8cd966f91b1f4681 100644 (file)
--- a/gdk/win32/gdkevents-win32.c
+++ b/gdk/win32/gdkevents-win32.c
@@ -2730,7 +2730,8 @@ gdk_event_translate (MSG  *msg,
                gdk_pointer_ungrab (msg->time);
            }
 
-         if (keyboard_grab->window == window)
+         if (keyboard_grab != NULL &&
+             keyboard_grab->window == window)
            gdk_keyboard_ungrab (msg->time);
        }