only process args that exist

ASTERISK-18395
........

Merged revisions 341809 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@341810 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/pbx/pbx_lua.c b/pbx/pbx_lua.c
index db6090a6001f6e84e085b81a58dfb14818aa7eea..0dccfe644d4e2e89536dce6bbcf9e189e6c8fea1 100644 (file)
--- a/pbx/pbx_lua.c
+++ b/pbx/pbx_lua.c
@@ -669,7 +669,7 @@ static void lua_concat_args(lua_State *L, int start, int nargs) {
        int concat = 0;
        int i = start + 1;
 
-       if (!lua_isnil(L, start)) {
+       if (start <= nargs && !lua_isnil(L, start)) {
                lua_pushvalue(L, start);
                concat += 1;
        }