From ea8cff230088d442539976c75b85368d38429b06 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Fri, 22 Mar 2019 13:32:16 +0100
Subject: etp: Don't crash etp-stack* when c_p->i is null

---
 erts/etc/unix/etp-commands.in | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/erts/etc/unix/etp-commands.in b/erts/etc/unix/etp-commands.in
index e8dc59156f..dc28107ef5 100644
--- a/erts/etc/unix/etp-commands.in
+++ b/erts/etc/unix/etp-commands.in
@@ -1453,8 +1453,10 @@ define etp-stack-preamble
   set $etp_stack_p = ($arg0)->stop
   set $etp_stack_end = ($arg0)->hend
   printf "%% Stacktrace (%u)\n", $etp_stack_end-$etp_stack_p
-  etp-1 ((Eterm)($arg0)->i) 0
-  printf "  (I)\n"
+  if ($arg0)->i != 0
+    etp-1 ((Eterm)($arg0)->i) 0
+    printf "  (I)\n"
+  end
   if ($arg0)->cp != 0
     etp-1 ((Eterm)($arg0)->cp) 0
     printf "  (cp)\n"
-- 
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