[Fix] jsx-no-script-url: avoid crash with boolean href

Fixes #2871

CHANGELOG.md

@@ -14,7 +14,9 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 * [`display-name`]/component detection: avoid a crash on anonymous components ([#2840][] @ljharb)
 * [`prop-types`]: function in class that returns a component causes false warning in typescript ([#2843][] @SyMind)
 * [`jsx-no-target-blank`]: avoid a crash with a non-string literal ([#2851][] @ljharb)
+* [`jsx-no-script-url`]: avoid crash with boolean `href` ([#2871][] @ljharb)
 
+[#2871]: https://github.com/yannickcr/eslint-plugin-react/issues/2871
 [#2851]: https://github.com/yannickcr/eslint-plugin-react/issues/2851
 [#2843]: https://github.com/yannickcr/eslint-plugin-react/pull/2843
 [#2840]: https://github.com/yannickcr/eslint-plugin-react/issues/2840

lib/rules/jsx-no-script-url.js

@@ -16,7 +16,7 @@ const docsUrl = require('../util/docsUrl');
 const isJavaScriptProtocol = /^[\u0000-\u001F ]*j[\r\n\t]*a[\r\n\t]*v[\r\n\t]*a[\r\n\t]*s[\r\n\t]*c[\r\n\t]*r[\r\n\t]*i[\r\n\t]*p[\r\n\t]*t[\r\n\t]*:/i;
 
 function hasJavaScriptProtocol(attr) {
-  return attr.value.type === 'Literal'
+  return attr.value && attr.value.type === 'Literal'
     && isJavaScriptProtocol.test(attr.value.value);
 }
 

tests/lib/rules/jsx-no-script-url.js

@@ -37,7 +37,8 @@ ruleTester.run('jsx-no-script-url', rule, {
     {code: '<a href=""></a>'},
     {code: '<a name="foo"></a>'},
     {code: '<a href={"javascript:"}></a>'},
-    {code: '<Foo href="javascript:"></Foo>'}
+    {code: '<Foo href="javascript:"></Foo>'},
+    {code: '<a href />'}
   ],
   invalid: [{
     code: '<a href="javascript:"></a>',