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-rw-r--r--unix/tkUnixWm.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/unix/tkUnixWm.c b/unix/tkUnixWm.c
index 09cd08d..60aaceb 100644
--- a/unix/tkUnixWm.c
+++ b/unix/tkUnixWm.c
@@ -6759,6 +6759,13 @@ TkSetTransientFor(Tk_Window tkwin, Tk_Window parent)
while (!Tk_IsTopLevel(parent))
parent = Tk_Parent(tkwin);
}
+ /*
+ * Prevent crash due to incomplete initialization, or other problems.
+ * [Bugs 3554026, 3561016]
+ */
+ if (((TkWindow *)parent)->wmInfoPtr->wrapperPtr == NULL) {
+ return;
+ }
XSetTransientForHint(Tk_Display(tkwin),
((TkWindow *)tkwin)->wmInfoPtr->wrapperPtr->window,
((TkWindow *)parent)->wmInfoPtr->wrapperPtr->window);