TypeError: Cannot read property 'range' of null with arrow-body-style

[paulschreiber]

Tell us about your environment

• ESLint Version: 6.8.0
• Node Version: 10.16.3
• npm Version: 6.13.7

Please show your full configuration:

{
    "parserOptions": {
        "ecmaVersion": 2015
    },
    "rules": {
        "arrow-body-style": ["error", "always"]
    }
}

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint.

87        parsedYears     = _map(years, (year) => (
88            {
89                index : year,
90                title : splitYear(year)
91            }
92        ));

./node_modules/.bin/eslint src --fix --ext=js --ext=jsx

What did you expect to happen?

The linter ran to completion

What actually happened? Please include the actual, raw output from ESLint.

TypeError: Cannot read property 'range' of null
Occurred while linting /home/paul/src/node_modules/my-parser/soccer.js:87
    at SourceCode.getTokenBefore (/home/paul/node_modules/eslint/lib/source-code/token-store/index.js:298:18)
    at Object.isParenthesised (/home/paul/node_modules/eslint/lib/rules/utils/ast-utils.js:257:38)
    at findClosingParen (/home/paul/node_modules/eslint/lib/rules/arrow-body-style.js:96:30)
    at Object.fix (/home/paul/node_modules/eslint/lib/rules/arrow-body-style.js:225:50)
    at normalizeFixes (/home/paul/node_modules/eslint/lib/linter/report-translator.js:178:28)
    at args (/home/paul/node_modules/eslint/lib/linter/report-translator.js:343:49)
    at Object.report (/home/paul/node_modules/eslint/lib/linter/linter.js:905:41)
    at validate (/home/paul/node_modules/eslint/lib/rules/arrow-body-style.js:202:29)
    at listeners.(anonymous function).forEach.listener (/home/paul/node_modules/eslint/lib/linter/safe-emitter.js:45:58)
    at Array.forEach (<anonymous>)
error Command failed with exit code 2.

Other rules work as expected (arrow-parens, keyword-spacing, indent, etc.)

[mdjermanovic]

Hi @paulschreiber, thanks for the bug report!

Confirmed in our Online Demo, working on this.