diff --git a/tsconfig.json b/tsconfig.json
index 1383e2f..a076c5c 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,6 +6,7 @@
     "module": "ESNext",
     "target": "ES6",
     "allowJs": true,
+    "strictNullChecks": true,
     "noImplicitAny": true,
     "moduleResolution": "node",
     "importHelpers": true,