From: Dmitry Volyntsev <xeioex@nginx.com>
Date: Fri, 17 Nov 2017 15:55:07 +0000 (+0300)
Subject: Checking that backtrace is available before accessing it.
X-Git-Tag: 0.1.15~10
X-Git-Url: http://www.kaiwu.me/postgresql/commit/?a=commitdiff_plain;h=60a43c5e5d1cc279fc5871aeb56c4338da50c309;p=njs.git

Checking that backtrace is available before accessing it.
---

diff --git a/njs/njscript.c b/njs/njscript.c
index 2dd1f509..e5925320 100644
--- a/njs/njscript.c
+++ b/njs/njscript.c
@@ -533,7 +533,7 @@ njs_vm_exception(njs_vm_t *vm, nxt_str_t *retval)
 nxt_array_t *
 njs_vm_backtrace(njs_vm_t *vm)
 {
-    if (!nxt_array_is_empty(vm->backtrace)) {
+    if (vm->backtrace != NULL && !nxt_array_is_empty(vm->backtrace)) {
         return vm->backtrace;
     }