diff --git a/src/core.js b/src/core.js
index 7eec1dc37..11c57a027 100644
--- a/src/core.js
+++ b/src/core.js
@@ -1349,7 +1349,7 @@ $.extend( $.validator, {
if ( this.checkable( element ) ) {
return this.getLength( value, element ) > 0;
}
- return value.length > 0;
+ return value !== undefined && value !== null && value.length > 0;
},
// https://jqueryvalidation.org/email-method/
diff --git a/test/rules.js b/test/rules.js
index cfd9f8577..1be57bf49 100644
--- a/test/rules.js
+++ b/test/rules.js
@@ -402,3 +402,23 @@ QUnit.test( "rules() - on unexpected input", function( assert ) {
result = nonFormElement.rules( "add", "whatever" );
assert.deepEqual( result, undefined, "can work on a non-form element" );
} );
+
+QUnit.test( "required method should return false for undefined & null values", function( assert ) {
+ var username = $( "#usernamec" ),
+ urlc = $( "#urlc" ),
+ v = $( "#testForm1clean" ).validate( {
+ rules: {
+ username: {
+ required: true,
+ normalizer: function() { return null; }
+ },
+ urlc: {
+ required: true,
+ normalizer: function() { return undefined; }
+ }
+ }
+ } );
+
+ assert.notOk( v.element( username ), "The username element should be invalid" );
+ assert.notOk( v.element( urlc ), "The urlc element should be invalid" );
+} );
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