diff --git a/code/web/task_schedule/tsconfig.json b/code/web/task_schedule/tsconfig.json
index 01de560..5e2a62a 100644
--- a/code/web/task_schedule/tsconfig.json
+++ b/code/web/task_schedule/tsconfig.json
@@ -15,6 +15,7 @@
         "module": "ESNext",
         "moduleResolution": "node",
         "strict": true,
+        "strictNullChecks": true,
         "jsx": "preserve",
         "sourceMap": true,
         "resolveJsonModule": true,