diff --git a/dwm.c b/dwm.c
index 33a73b1..a435cc7 100644
--- a/dwm.c
+++ b/dwm.c
@@ -1833,6 +1833,8 @@ nexttiled(Client *c)
 void
 movestack(const Arg *arg) {
 	Client *c = NULL, *p = NULL, *pc = NULL, *i;
+	if (!selmon->sel)
+		return;
 
 	if(arg->i > 0) {
 		/* find the client after selmon->sel */