Ensure data's existence before trying to access it. (issue #8774 reported by rcourtna)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@50266 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/pbx.c b/main/pbx.c
index 0c3c88472830a4ef0ed6c36e72e064233c4c840c..8b5a3ee75a3c025b4b04413e2ef2d64c21d209ca 100644 (file)
--- a/main/pbx.c
+++ b/main/pbx.c
@@ -1709,7 +1709,7 @@ static void pbx_substitute_variables(char *passdata, int datalen, struct ast_cha
        memset(passdata, 0, datalen);
 
        /* No variables or expressions in e->data, so why scan it? */
-       if (!strchr(e->data, '$') && !strstr(e->data,"${") && !strstr(e->data,"$[") && !strstr(e->data,"$(")) {
+       if (e->data && !strchr(e->data, '$') && !strstr(e->data,"${") && !strstr(e->data,"$[") && !strstr(e->data,"$(")) {
                ast_copy_string(passdata, e->data, datalen);
                return;
        }