diff --git a/src/util/headsignUtils.ts b/src/util/headsignUtils.ts
index 9d4552cf..98e7cf67 100644
--- a/src/util/headsignUtils.ts
+++ b/src/util/headsignUtils.ts
@@ -1,9 +1,9 @@
 export const trimMetroIcon = headsign =>
   headsign
-    .toLowerCase()
+    ?.toLowerCase()
     .replace(/\(m\)/g, '')
     .trim()
     .replace(/\s{2,}/g, ' ');
 
 export const getRenameDestinationId = (headsign: string, gtfsId: string) =>
-  headsign.concat(' - ', gtfsId).toLowerCase();
+  headsign?.concat(' - ', gtfsId).toLowerCase();