diff --git a/modules/slowzones/SystemSlowZonesDetails.tsx b/modules/slowzones/SystemSlowZonesDetails.tsx
index 764e2d0c..133cda3c 100644
--- a/modules/slowzones/SystemSlowZonesDetails.tsx
+++ b/modules/slowzones/SystemSlowZonesDetails.tsx
@@ -44,7 +44,7 @@ export function SystemSlowZonesDetails({ showTitle = false }: SystemSlowZonesDet
     query: { startDate, endDate },
   } = useDelimitatedRoute();
 
-  const speedRestrictions = useSpeedRestrictionData({ lineId: line!, date: endDate! });
+  const speedRestrictions = useSpeedRestrictionData({ lineId: line, date: endDate! });
 
   const startDateUTC = startDate ? dayjs.utc(startDate).startOf('day') : undefined;
   const endDateUTC = endDate ? dayjs.utc(endDate).startOf('day') : undefined;
diff --git a/tsconfig.json b/tsconfig.json
index 9d6b718a..c0f7ee65 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -25,5 +25,5 @@
     ]
   },
   "include": ["next-env.d.ts", "globals.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
-  "exclude": ["node_modules"]
+  "exclude": ["node_modules", "*.js"]
 }