diff --git a/wp-includes/ms-functions.php b/wp-includes/ms-functions.php
index b3fc55a6d3..7b87c1fb7c 100644
--- a/wp-includes/ms-functions.php
+++ b/wp-includes/ms-functions.php
@@ -2420,15 +2420,15 @@ Thanks!
  *
  * @since 2.8.5
  *
- * @param bool $force
+ * @param bool|null $force Optional. Whether to force SSL in admin screens. Default null.
  * @return bool True if forced, false if not forced.
  */
-function force_ssl_content( $force = '' ) {
+function force_ssl_content( $force = null ) {
 	static $forced_content = false;
 
-	if ( ! $force ) {
+	if ( ! is_null( $force ) ) {
 		$old_forced     = $forced_content;
-		$forced_content = $force;
+		$forced_content = (bool) $force;
 		return $old_forced;
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index de3c5e0df8..70b954d00e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.9-alpha-60142';
+$wp_version = '6.9-alpha-60147';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.