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-rw-r--r--xlib/xgc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/xlib/xgc.c b/xlib/xgc.c
index 0cebbc8..c6836bd 100644
--- a/xlib/xgc.c
+++ b/xlib/xgc.c
@@ -465,7 +465,7 @@ TkSetRegion(
TkRegion r)
{
if (r == None) {
- FreeClipMask(gc);
+ Tcl_Panic("must not pass None to TkSetRegion for compatibility with X11; use XSetClipMask instead");
} else {
TkpClipMask *clip_mask = AllocClipMask(gc);