1 files changed, 1 insertions, 1 deletions

diff --git a/play.js b/play.js
index 16bc072..a1e2313 100644
--- a/play.js
+++ b/play.js
@@ -369,7 +369,7 @@ function focus_stack(stack) {
 	if (focus !== stack) {
 		focus = stack
 		update_map()
-		return stack.length <= 1
+		return !stack || stack.length <= 1
 	}
 	return true
 }