diff --git a/tsconfig.json b/tsconfig.json
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -27,7 +27,7 @@
     /* Strict Type-Checking Options */
     "strict": true,                                 /* Enable all strict type-checking options. */
     // "noImplicitAny": true,                       /* Raise error on expressions and declarations with an implied 'any' type. */
-    // "strictNullChecks": true,                    /* Enable strict null checks. */
+    "strictNullChecks": true,                    /* Enable strict null checks. */
     // "strictFunctionTypes": true,                 /* Enable strict checking of function types. */
     // "strictBindCallApply": true,                 /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
     // "strictPropertyInitialization": true,        /* Enable strict checking of property initialization in classes. */