win32ss/user/ntuser/painting.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/win32ss/user/ntuser/painting.c b/win32ss/user/ntuser/painting.c
index e6fb2d6831f..0d101d74487 100644
--- a/win32ss/user/ntuser/painting.c
+++ b/win32ss/user/ntuser/painting.c
@@ -675,6 +675,12 @@ IntInvalidateWindows(PWND Wnd, PREGION Rgn, ULONG Flags)
          {
              RgnType = IntGdiCombineRgn(Rgn, Rgn, RgnWindow, RGN_AND);
              REGION_Delete(RgnWindow);
+             /* Nothing to paint, just return */
+             if (RgnType == NULLREGION || RgnType == ERROR)
+             {
+                 Wnd->state &= ~WNDS_NONCPAINT;
+                 return;
+             }
          }
       }
       else