diff --git a/src/wp-includes/kses.php b/src/wp-includes/kses.php
index 93fc9dd00b..265fb748ac 100644
--- a/src/wp-includes/kses.php
+++ b/src/wp-includes/kses.php
@@ -1047,7 +1047,8 @@ function wp_kses_attr( $element, $attr, $allowed_html, $allowed_protocols ) {
 	}
 
 	// Are any attributes allowed at all for this element?
-	if ( ! isset( $allowed_html[ strtolower( $element ) ] ) || true === $allowed_html[ strtolower( $element ) ] || count( $allowed_html[ strtolower( $element ) ] ) == 0 ) {
+	$element_low = strtolower( $element );
+	if ( empty( $allowed_html[ $element_low ] ) || true === $allowed_html[ $element_low ] ) {
 		return "<$element$xhtml_slash>";
 	}
 
diff --git a/tests/phpunit/tests/kses.php b/tests/phpunit/tests/kses.php
index 1a307972cc..8be7f9379c 100644
--- a/tests/phpunit/tests/kses.php
+++ b/tests/phpunit/tests/kses.php
@@ -722,4 +722,14 @@ EOF;
 
 		$this->assertEquals( "<{$element} title=\"foo\">", wp_kses_attr( $element, $attribute, array( 'foo' => array( 'title' => true ) ), array() ) );
 	}
+
+	/**
+	 * @ticket 43312
+	 */
+	function test_wp_kses_attr_no_attributes_allowed_with_false() {
+		$element   = 'foo';
+		$attribute = 'title="foo" class="bar"';
+
+		$this->assertEquals( "<{$element}>", wp_kses_attr( $element, $attribute, array( 'foo' => false ), array() ) );
+	}
 }