diff --git a/src/wp-includes/comment-template.php b/src/wp-includes/comment-template.php
index 200b2e095f..5a1b2e22eb 100644
--- a/src/wp-includes/comment-template.php
+++ b/src/wp-includes/comment-template.php
@@ -1241,7 +1241,7 @@ function comments_open( $post_id = null ) {
 	$_post = get_post( $post_id );
 
 	$post_id = $_post ? $_post->ID : 0;
-	$open    = ( 'open' === $_post->comment_status );
+	$open    = ( $_post && ( 'open' === $_post->comment_status ) );
 
 	/**
 	 * Filters whether the current post is open for comments.
@@ -1271,7 +1271,7 @@ function pings_open( $post_id = null ) {
 	$_post = get_post( $post_id );
 
 	$post_id = $_post ? $_post->ID : 0;
-	$open    = ( 'open' === $_post->ping_status );
+	$open    = ( $_post && ( 'open' === $_post->ping_status ) );
 
 	/**
 	 * Filters whether the current post is open for pings.
diff --git a/tests/phpunit/tests/comment/commentsOpen.php b/tests/phpunit/tests/comment/commentsOpen.php
new file mode 100644
index 0000000000..54e08ea8ed
--- /dev/null
+++ b/tests/phpunit/tests/comment/commentsOpen.php
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * @group  comment
+ * @covers ::comments_open
+ */
+class Tests_Comment_CommentsOpen extends WP_UnitTestCase {
+
+	/**
+	 * @ticket 54159
+	 */
+	public function test_post_does_not_exist() {
+		$this->assertFalse( comments_open( 99999 ) );
+	}
+
+	/**
+	 * @ticket 54159
+	 */
+	public function test_post_exist_status_open() {
+		$post = $this->factory->post->create_and_get();
+		$this->assertTrue( comments_open( $post ) );
+	}
+
+	/**
+	 * @ticket 54159
+	 */
+	public function test_post_exist_status_closed() {
+		$post                 = $this->factory->post->create_and_get();
+		$post->comment_status = 'closed';
+
+		$this->assertFalse( comments_open( $post ) );
+	}
+}
diff --git a/tests/phpunit/tests/comment/pingsOpen.php b/tests/phpunit/tests/comment/pingsOpen.php
new file mode 100644
index 0000000000..2ef7029804
--- /dev/null
+++ b/tests/phpunit/tests/comment/pingsOpen.php
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * @group  comment
+ * @covers ::pings_open
+ */
+class Tests_Comment_PingsOpen extends WP_UnitTestCase {
+
+	/**
+	 * @ticket 54159
+	 */
+	public function test_post_does_not_exist() {
+		$this->assertFalse( pings_open( 99999 ) );
+	}
+
+	/**
+	 * @ticket 54159
+	 */
+	public function test_post_exist_status_open() {
+		$post = $this->factory->post->create_and_get();
+		$this->assertTrue( pings_open( $post ) );
+	}
+
+	/**
+	 * @ticket 54159
+	 */
+	public function test_post_exist_status_closed() {
+		$post              = $this->factory->post->create_and_get();
+		$post->ping_status = 'closed';
+
+		$this->assertFalse( pings_open( $post ) );
+	}
+}