Index: app_chanspy.c
===================================================================
--- app_chanspy.c	(revision 127827)
+++ app_chanspy.c	(working copy)
@@ -576,12 +576,14 @@
 			}
 
 			if (mygroup) {
+				ast_channel_lock(peer);
 				if ((group = pbx_builtin_getvar_helper(peer, "SPYGROUP"))) {
 					dup_group = ast_strdupa(group);
 					num_groups = ast_app_separate_args(dup_group, ':', groups,
 									   sizeof(groups) / sizeof(groups[0]));
 				}
-				
+				ast_channel_unlock(peer);
+
 				for (x = 0; x < num_groups; x++) {
 					if (!strcmp(mygroup, groups[x])) {
 						igrp = 1;