no-namespace: TypeError: Cannot read property 'indexOf' of null

[AriPerkkio]

Hello, no-namespace rule seems to crash in certain cases. This issue was spotted by automated CI run - it is not blocking my development or anything.

AriPerkkio/eslint-remote-tester#282 (comment)

"eslint-plugin-react": "^7.26.0",

{
  "root": true,
  "env": {
    "es6": true
  },
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true
    }
  },
  "settings": {
    "react": {
      "version": "16.13.1"
    }
  },
  "plugins": ["react"],
  "rules": {
    "react/no-namespace": "error"
  }
}

Minimal repro:

import React from "react";

React.createElement(null);

TypeError: Cannot read property 'indexOf' of null
Occurred while linting /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint-remote-tester/.cache-eslint-remote-tester/aqkj/reactLearn/packages/react/src/__tests__/ReactElementValidator-test.internal.js:239
    at CallExpression (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint-plugin-react/lib/rules/no-namespace.js:43:20)
    at /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/safe-emitter.js:45:58

Crash reports from real projects

Rule: no-namespace

• Message: Cannot read property 'indexOf' of null Occurred while linting /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint-remote-tester/.cache-eslint-remote-tester/aqkj/reactLearn/packages/react/src/__tests__/ReactElementValidator-test.internal.js:239
• Path: aqkj/reactLearn/packages/react/src/__tests__/ReactElementValidator-test.internal.js
• Link

  237 |     expect(() => {
  238 |       React.createElement(undefined);
> 239 |       React.createElement(null);
  240 |       React.createElement(true);
  241 |       React.createElement({x: 17});
  242 |       React.createElement({});

TypeError: Cannot read property 'indexOf' of null
Occurred while linting /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint-remote-tester/.cache-eslint-remote-tester/aqkj/reactLearn/packages/react/src/__tests__/ReactElementValidator-test.internal.js:239
    at CallExpression (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint-plugin-react/lib/rules/no-namespace.js:43:20)
    at /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/safe-emitter.js:45:58
    at Array.forEach (<anonymous>)
    at Object.emit (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/safe-emitter.js:45:38)
    at NodeEventGenerator.applySelector (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/node-event-generator.js:293:26)
    at NodeEventGenerator.applySelectors (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/node-event-generator.js:322:22)
    at NodeEventGenerator.enterNode (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/node-event-generator.js:336:14)
    at CodePathAnalyzer.enterNode (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/code-path-analysis/code-path-analyzer.js:711:23)
    at /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/linter.js:960:32
    at Array.forEach (<anonymous>)

Rule: no-namespace

• Message: Cannot read property 'indexOf' of null Occurred while linting /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint-remote-tester/.cache-eslint-remote-tester/facebook/react/packages/react/src/__tests__/ReactElementValidator-test.internal.js:239
• Path: facebook/react/packages/react/src/__tests__/ReactElementValidator-test.internal.js
• Link

  237 |     expect(() => {
  238 |       React.createElement(undefined);
> 239 |       React.createElement(null);
  240 |       React.createElement(true);
  241 |       React.createElement({x: 17});
  242 |       React.createElement({});

TypeError: Cannot read property 'indexOf' of null
Occurred while linting /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint-remote-tester/.cache-eslint-remote-tester/facebook/react/packages/react/src/__tests__/ReactElementValidator-test.internal.js:239
    at CallExpression (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint-plugin-react/lib/rules/no-namespace.js:43:20)
    at /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/safe-emitter.js:45:58
    at Array.forEach (<anonymous>)
    at Object.emit (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/safe-emitter.js:45:38)
    at NodeEventGenerator.applySelector (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/node-event-generator.js:293:26)
    at NodeEventGenerator.applySelectors (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/node-event-generator.js:322:22)
    at NodeEventGenerator.enterNode (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/node-event-generator.js:336:14)
    at CodePathAnalyzer.enterNode (/home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/code-path-analysis/code-path-analyzer.js:711:23)
    at /home/runner/work/eslint-remote-tester/eslint-remote-tester/ci/node_modules/eslint/lib/linter/linter.js:960:32
    at Array.forEach (<anonymous>)