Fixed calling getPrototypeOf(null) (#155)

* fixed calling getPrototypeOf(null)
cloudflare · Jan 18, 2022 · d93200a · d93200a
1 parent 6c69497
commit d93200a
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/packages/runner-vm/src/instanceof.ts b/packages/runner-vm/src/instanceof.ts
@@ -85,6 +85,7 @@ function ordinaryHasInstance(C: any, O: any): boolean {
   // 2. If C has a [[BoundTargetFunction]] internal slot, ... (IGNORED)
   // 3. If Type(O) is not Object, return false.
   if (typeof O !== "object" && typeof O !== "function") return false;
+  if (O === null) return false;
   // 4. Let P be ? Get(C, "prototype").
   const P = C.prototype;
   // 5. If Type(P) is not Object, throw a TypeError exception.