[Fix] jsx-key: avoid a crash on a non-array node.body

Fixes #3328

Author: ljharb

CHANGELOG.md

@@ -13,12 +13,14 @@ This change log adheres to standards from [Keep a CHANGELOG](https://keepachange
 * [`jsx-key`]: catch key errors inside conditional statements ([#3320][] @TildaDares)
 * [`display-name`]: Accept forwardRef and Memo nesting in newer React versions ([#3321][] @TildaDares)
 * [`jsx-key`]: avoid a crash from optional chaining from [#3320][] ([#3327][] @ljharb)
+* [`jsx-key`]: avoid a crash on a non-array node.body from [#3320][] ([#3328][] @ljharb)
 
 ### Changed
 * [Refactor] [`jsx-indent-props`]: improved readability of the checkNodesIndent function ([#3315][] @caroline223)
 * [Tests] [`jsx-indent`], [`jsx-one-expression-per-line`]: add passing test cases ([#3314][] @ROSSROSALES)
 * [Refactor] `boolean-prop-naming`, `jsx-indent`: avoid assigning to arguments ([#3316][] @caroline223)
 
+[#3328]: https://github.com/jsx-eslint/eslint-plugin-react/issues/3328
 [#3327]: https://github.com/jsx-eslint/eslint-plugin-react/issues/3327
 [#3321]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3321
 [#3320]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3320

lib/rules/jsx-key.js

@@ -95,7 +95,7 @@ module.exports = {
         if (node.alternate) {
           getReturnStatements(node.alternate, returnStatements);
         }
-      } else if (node.body) {
+      } else if (Array.isArray(node.body)) {
         node.body.forEach((item) => {
           if (item.type === 'IfStatement') {
             getReturnStatements(item, returnStatements);