diff --git src/wp-includes/functions.php src/wp-includes/functions.php
index 914cbb9..8b99405 100644
--- src/wp-includes/functions.php
+++ src/wp-includes/functions.php
@@ -1213,18 +1213,6 @@ function bool_from_yn( $yn ) {
 function do_feed() {
 	global $wp_query;
 
-	// Determine if we are looking at the main comment feed
-	$is_main_comments_feed = ( $wp_query->is_comment_feed() && ! $wp_query->is_singular() );
-
-	/*
-	 * Check the queried object for the existence of posts if it is not a feed for an archive,
-	 * search result, or main comments. By checking for the absense of posts we can prevent rendering the feed
-	 * templates at invalid endpoints. e.g.) /wp-content/plugins/feed/
-	 */
-	if ( ! $wp_query->have_posts() && ! ( $wp_query->is_archive() || $wp_query->is_search() || $is_main_comments_feed ) ) {
-		wp_die( __( 'ERROR: This is not a valid feed.' ), '', array( 'response' => 404 ) );
-	}
-
 	$feed = get_query_var( 'feed' );
 
 	// Remove the pad, if present.
diff --git tests/phpunit/tests/feed/rss2.php tests/phpunit/tests/feed/rss2.php
index fab3726..d48bc88 100644
--- tests/phpunit/tests/feed/rss2.php
+++ tests/phpunit/tests/feed/rss2.php
@@ -457,41 +457,4 @@ class Tests_Feeds_RSS2 extends WP_UnitTestCase {
 		// There should only be one <rss> child element.
 		$this->assertEquals( 1, count( $rss ) );
 	}
-
-	/*
-	 * Check to make sure we are not rendering feed templates for invalid feed endpoints.
-	 * e.g. https://example.com/wp-content/feed/
-	 *
-	 * @ticket 30210
-	 */
-	function test_invalid_feed_endpoint() {
-		// An example of an invalid feed endpoint
-		$this->go_to( 'wp-content/feed/' );
-
-		// Queries performed on invalid feed endpoints should never contain posts.
-		$this->assertFalse( have_posts() );
-
-		// This is the assertion. Once the exception is thrown in do_feed, execution stops, preventing futher assertions.
-		$this->setExpectedException( 'WPDieException', 'ERROR: This is not a valid feed.' );
-		do_feed();
-	}
-
-	/*
-	 * Make sure the requested feed is registered before rendering the requested template.
-	 *
-	 * @ticket 30210
-	 */
-	function test_nonexistent_feeds() {
-		global $wp_rewrite;
-		$badfeed = 'badfeed';
-
-		$this->assertNotContains( $badfeed, $wp_rewrite->feeds );
-
-		$this->go_to( '/?feed=' . $badfeed );
-
-		// This is the assertion. Once the exception is thrown in do_feed, execution stops, preventing futher assertions.
-		$this->setExpectedException( 'WPDieException', 'ERROR: This is not a valid feed template.' );
-		do_feed();
-	}
-
 }