diff --git a/src/controller/publicController.ts b/src/controller/publicController.ts
index 5b3769a..8c627fc 100644
--- a/src/controller/publicController.ts
+++ b/src/controller/publicController.ts
@@ -22,6 +22,8 @@ export async function getCalendarItemsByTypes(req: Request, res: Response): Prom
     throw new InternalException("set output query value to `ics` or `json` (defaults to `ics`)");
   }
 
+  types = types.filter((t) => t);
+
   let items: Array<calendar> = [];
   if (types.length != 0) {
     let typeIds = await CalendarTypeService.getByTypes((types as Array<string>).map((t) => t.split(":")[0]));