Index: group.c
===================================================================
RCS file: /cvs/xenocara/app/cwm/group.c,v
retrieving revision 1.121
diff -u -r1.121 group.c
--- group.c	10 Nov 2015 20:05:33 -0000	1.121
+++ group.c	25 Nov 2015 16:36:02 -0000
@@ -152,19 +152,21 @@
 group_movetogroup(struct client_ctx *cc, int idx)
 {
 	struct screen_ctx	*sc = cc->sc;
-	struct group_ctx	*gc;
+	struct group_ctx	*gc = NULL;
 
 	if (idx < 0 || idx >= CALMWM_NGROUPS)
 		errx(1, "group_movetogroup: index out of range (%d)", idx);
 
-	TAILQ_FOREACH(gc, &sc->groupq, entry) {
-		if (gc->num == idx)
-			break;
+	if (idx != 0) {
+		TAILQ_FOREACH(gc, &sc->groupq, entry) {
+			if (gc->num == idx)
+				break;
+		}
 	}
 
 	if (cc->gc == gc)
 		return;
-	if (group_holds_only_hidden(gc))
+	if (gc != NULL && group_holds_only_hidden(gc))
 		client_hide(cc);
 	group_assign(gc, cc);
 }