diff --git a/wp-includes/class-wp-dependency.php b/wp-includes/class-wp-dependency.php
index c4335b9bab..a018811773 100644
--- a/wp-includes/class-wp-dependency.php
+++ b/wp-includes/class-wp-dependency.php
@@ -126,7 +126,7 @@ class _WP_Dependency {
 	 * @param string $path   Optional. The full file path to the directory containing translation files.
 	 * @return bool False if $domain is not a string, true otherwise.
 	 */
-	public function set_translations( $domain, $path = null ) {
+	public function set_translations( $domain, $path = '' ) {
 		if ( ! is_string( $domain ) ) {
 			return false;
 		}
diff --git a/wp-includes/class-wp-scripts.php b/wp-includes/class-wp-scripts.php
index c8179da840..5374aa912a 100644
--- a/wp-includes/class-wp-scripts.php
+++ b/wp-includes/class-wp-scripts.php
@@ -573,7 +573,7 @@ class WP_Scripts extends WP_Dependencies {
 	 * @param string $path   Optional. The full file path to the directory containing translation files.
 	 * @return bool True if the text domain was registered, false if not.
 	 */
-	public function set_translations( $handle, $domain = 'default', $path = null ) {
+	public function set_translations( $handle, $domain = 'default', $path = '' ) {
 		if ( ! isset( $this->registered[ $handle ] ) ) {
 			return false;
 		}
@@ -605,7 +605,11 @@ class WP_Scripts extends WP_Dependencies {
 		}
 
 		$domain = $this->registered[ $handle ]->textdomain;
-		$path   = $this->registered[ $handle ]->translations_path;
+		$path   = '';
+
+		if ( isset( $this->registered[ $handle ]->translations_path ) ) {
+			$path = $this->registered[ $handle ]->translations_path;
+		}
 
 		$json_translations = load_script_textdomain( $handle, $domain, $path );
 
diff --git a/wp-includes/functions.wp-scripts.php b/wp-includes/functions.wp-scripts.php
index 4dd7122b45..b298f9c573 100644
--- a/wp-includes/functions.wp-scripts.php
+++ b/wp-includes/functions.wp-scripts.php
@@ -237,7 +237,7 @@ function wp_localize_script( $handle, $object_name, $l10n ) {
  * @param string $path   Optional. The full file path to the directory containing translation files.
  * @return bool True if the text domain was successfully localized, false otherwise.
  */
-function wp_set_script_translations( $handle, $domain = 'default', $path = null ) {
+function wp_set_script_translations( $handle, $domain = 'default', $path = '' ) {
 	global $wp_scripts;
 
 	if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
diff --git a/wp-includes/l10n.php b/wp-includes/l10n.php
index 6a63f12a57..ea4ca9bcd3 100644
--- a/wp-includes/l10n.php
+++ b/wp-includes/l10n.php
@@ -1065,10 +1065,7 @@ function load_script_textdomain( $handle, $domain = 'default', $path = '' ) {
 		return false;
 	}
 
-	if ( is_string( $path ) ) {
-		$path = untrailingslashit( $path );
-	}
-
+	$path   = untrailingslashit( $path );
 	$locale = determine_locale();
 
 	// If a path was given and the handle file exists simply return it.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3e4bf68253..0f8bbecfa9 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-beta2-54350';
+$wp_version = '6.1-beta2-54351';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.