diff --git a/erpnext/venue/doctype/item_booking_calendar/item_booking_calendar.js b/erpnext/venue/doctype/item_booking_calendar/item_booking_calendar.js
index a12f9c6a954dc4d77ef5bfb2c2389bfd63cee3d6..41423a6f1639d27c006e313350220eb951287f11 100644
--- a/erpnext/venue/doctype/item_booking_calendar/item_booking_calendar.js
+++ b/erpnext/venue/doctype/item_booking_calendar/item_booking_calendar.js
@@ -71,3 +71,12 @@ frappe.ui.form.on('Item Booking Calendar', {
 		dialog.show();
 	}
 });
+
+frappe.ui.form.on("Item Booking Calendar Exception", {
+	exceptions_add(frm, cdt, cdn) {
+		// https://discuss.frappe.io/t/91101
+		const row = locals[cdt][cdn];
+		row.start_time = "";
+		row.end_time = "";
+	},
+});