diff --git a/src/collections/Events.ts b/src/collections/Events.ts
index 3f11e84..9f09096 100644
--- a/src/collections/Events.ts
+++ b/src/collections/Events.ts
@@ -44,6 +44,9 @@ const Events: CollectionConfig = {
 					label: 'End Time',
 					type: 'date',
 					validate: (val, { siblingData }) => {
+						if (!val)
+							return true;
+
 						const end = new Date(val).getTime();
 						const start = new Date(siblingData.startTime).getTime();