Fix core dump after a dropped X connection.

* sysdep.c (stuff_char): Don't abort merely because the selected frame
is dead, as we may be shutting down.

Fixes: debbugs:17704

1 files changed, 3 insertions, 1 deletions

diff --git a/src/sysdep.c b/src/sysdep.c
index 2eedd1fc6cb..211a3bb706f 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -222,7 +222,9 @@ discard_tty_input (void)
 void
 stuff_char (char c)
 {
-  if (! FRAME_TERMCAP_P (SELECTED_FRAME ()))
+  if (! (FRAMEP (selected_frame)
+         && FRAME_LIVE_P (XFRAME (selected_frame))
+         && FRAME_TERMCAP_P (XFRAME (selected_frame))))
     return;
 
 /* Should perhaps error if in batch mode */