fix: checking for correct resolver value in editor

packages/core/src/editor/Editor.tsx

@@ -18,7 +18,9 @@ export const Editor: React.FC<React.PropsWithChildren<Partial<Options>>> = ({
   // we do not want to warn the user if no resolver was supplied
   if (options.resolver !== undefined) {
     invariant(
-      typeof options.resolver === 'object' && !Array.isArray(options.resolver),
+      typeof options.resolver === 'object' &&
+        !Array.isArray(options.resolver) &&
+        options.resolver !== null,
       ERROR_RESOLVER_NOT_AN_OBJECT
     );
   }

packages/core/src/editor/tests/editor.test.tsx

@@ -0,0 +1,15 @@
+import { ERROR_RESOLVER_NOT_AN_OBJECT } from '@craftjs/utils';
+import { render } from '@testing-library/react';
+import * as React from 'react';
+
+import { Resolver } from '../../interfaces';
+import { Editor } from '../Editor';
+
+describe('Editor Component', () => {
+  it('should throw an error when we use <Editor /> with resolvers that are not valid objects', () => {
+    expect(() => {
+      const resolver = (null as unknown) as Resolver;
+      render(<Editor resolver={resolver} />);
+    }).toThrowError(ERROR_RESOLVER_NOT_AN_OBJECT);
+  });
+});