1 files changed, 2 insertions, 0 deletions
diff --git a/play.js b/play.js
index 1408a0a..89a5413 100644
--- a/play.js
+++ b/play.js
@@ -16,6 +16,8 @@ const ANTITANK = 2
 const ARTILLERY = 3
 
 function set_has(set, item) {
+	if (!set)
+		return false
 	let a = 0
 	let b = set.length - 1
 	while (a <= b) {