diff --git a/src/wp-includes/ms-site.php b/src/wp-includes/ms-site.php
index d4f9a5f9d0..61b81185cc 100644
--- a/src/wp-includes/ms-site.php
+++ b/src/wp-includes/ms-site.php
@@ -69,9 +69,11 @@ function wp_insert_site( array $data ) {
 		return new WP_Error( 'db_insert_error', __( 'Could not insert site into the database.' ), $wpdb->last_error );
 	}
 
-	clean_blog_cache( $wpdb->insert_id );
+	$site_id = (int) $wpdb->insert_id;
 
-	$new_site = get_site( $wpdb->insert_id );
+	clean_blog_cache( $site_id );
+
+	$new_site = get_site( $site_id );
 
 	if ( ! $new_site ) {
 		return new WP_Error( 'get_site_error', __( 'Could not retrieve site data.' ) );
diff --git a/tests/phpunit/tests/multisite/site.php b/tests/phpunit/tests/multisite/site.php
index fc7d5bf13b..de4a79f52d 100644
--- a/tests/phpunit/tests/multisite/site.php
+++ b/tests/phpunit/tests/multisite/site.php
@@ -1386,6 +1386,32 @@ if ( is_multisite() ) :
 			);
 		}
 
+		/**
+		 * @ticket 50324
+		 */
+		public function test_wp_insert_site_with_clean_site_cache() {
+			remove_action( 'wp_initialize_site', 'wp_initialize_site', 10 );
+
+			add_action( 'clean_site_cache', array( $this, 'action_database_insert_on_clean_site_cache' ) );
+
+			$site_id = wp_insert_site(
+				array(
+					'domain'     => 'valid-domain.com',
+					'path'       => '/valid-path/',
+					'network_id' => 1,
+				)
+			);
+
+			remove_action( 'clean_site_cache', array( $this, 'action_database_insert_on_clean_site_cache' ) );
+
+			$this->assertInternalType( 'integer', $site_id );
+
+		}
+
+		public function action_database_insert_on_clean_site_cache() {
+			update_site_option( 'database_write_test.' . time(), true );
+		}
+
 		/**
 		 * @ticket 40364
 		 */