diff --git a/src/common/parser.ts b/src/common/parser.ts
index 5b0c9e5..d3f8227 100644
--- a/src/common/parser.ts
+++ b/src/common/parser.ts
@@ -70,7 +70,7 @@ export interface Event {
 	description: string;
 	type: string;
 	lineId: number;
-	location?: string; // Optional location field
+	location: string | null; // Optional location field
 }
 
 export async function getScheduleForLine(lineId: number) {
@@ -209,7 +209,7 @@ export async function getScheduleForLine(lineId: number) {
 				description,
 				type: $(td).find("td.program_typ").text().trim(),
 				lineId,
-				location: location || undefined, // Optional location field
+				location: location || null, // Optional location field
 			});
 
 			currentTime = new Date(endTime);