Fix null pointer dereference in app_groupcount.c (bug 1588)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2928 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/apps/app_groupcount.c b/apps/app_groupcount.c
index 094822f..778a139 100755 (executable)
--- a/apps/app_groupcount.c
+++ b/apps/app_groupcount.c
@@ -68,7 +68,7 @@ static int group_get_count(char *group)
                chan = ast_channel_walk(NULL);
                while(chan) {
                        test = pbx_builtin_getvar_helper(chan, "GROUP");
-                       if (!strcasecmp(test, group))
+                       if (test && !strcasecmp(test, group))
                                count++;
                        chan = ast_channel_walk(chan);
                }