1 files changed, 2 insertions, 2 deletions
diff --git a/rules.js b/rules.js
index ed62d77..2329cc6 100644
--- a/rules.js
+++ b/rules.js
@@ -7180,8 +7180,8 @@ exports.setup = function (seed, scenario, options) {
 
 exports.is_checkpoint = function (a, b) {
 	let an = 0, bn = 0
-	for (let line of a.log) if (line.startsWith(".h2")) ++an
-	for (let line of b.log) if (line.startsWith(".h2")) ++bn
+	for (let line of a.log) if (typeof line === "string" && line.startsWith(".h2")) ++an
+	for (let line of b.log) if (typeof line === "string" && line.startsWith(".h2")) ++bn
 	return an !== bn
 }