Index: channel.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channel.c,v
retrieving revision 1.70
diff -u -r1.70 channel.c
--- channel.c   7 Nov 2003 03:48:03 -0000       1.70
+++ channel.c   5 Dec 2003 20:03:28 -0000
@@ -356,12 +356,24 @@
        struct ast_frame *prev, *cur;
        int blah = 1;
        int qlen = 0;
+
+       if (!chan) {
+               ast_log(LOG_ERROR, "NULL chan");
+               return -1;
+       }
+       if (!chan->pvt) {
+               ast_log(LOG_ERROR, "NULL chan->pvt for %s", chan->name);
+               return -1;
+       }
+
        /* Build us a copy and free the original one */
        f = ast_frdup(fin);
        if (!f) {
                ast_log(LOG_WARNING, "Unable to duplicate frame\n");
                return -1;
        }
+
+
        if (lock)
                ast_mutex_lock(&chan->lock);
        prev = NULL;