diff --git a/inc/helpers/class-site-duplicator.php b/inc/helpers/class-site-duplicator.php
index 4594d57c..9a5fdb11 100644
--- a/inc/helpers/class-site-duplicator.php
+++ b/inc/helpers/class-site-duplicator.php
@@ -58,10 +58,17 @@ private function __construct() {}
 	 */
 	public static function duplicate_site($from_site_id, $title, $args = []) {
 
-		$args['from_site_id'] = $from_site_id;
-		$args['title']        = $title;
+		$from_site = get_site($from_site_id);
 
-		$duplicate_site = self::process_duplication($args);
+		if ( ! $from_site) {
+			// translators: %d is the source template site ID.
+			$duplicate_site = new \WP_Error('source_template_site_not_found', sprintf(__('Source template site %d not found. Cannot duplicate site.', 'ultimate-multisite'), $from_site_id));
+		} else {
+			$args['from_site_id'] = $from_site_id;
+			$args['title']        = $title;
+
+			$duplicate_site = self::process_duplication($args);
+		}
 
 		if (is_wp_error($duplicate_site)) {
 
diff --git a/inc/models/class-site.php b/inc/models/class-site.php
index d968eafb..37862c3c 100644
--- a/inc/models/class-site.php
+++ b/inc/models/class-site.php
@@ -2029,9 +2029,9 @@ public function save() {
 					);
 				}
 
-				if ($saved && $this->get_public()) {
+				if ( ! is_wp_error($saved) && is_numeric($saved) && $this->get_public()) {
 					$profile_stage = microtime(true);
-					$site_id       = $saved;
+					$site_id       = (int) $saved;
 
 					wp_update_site(
 						$site_id,
@@ -2040,7 +2040,7 @@ public function save() {
 						]
 					);
 					$this->profile_sovereign_provisioning_stage(
-						(int) $saved,
+						$site_id,
 						'um_site.save_wp_update_site_public',
 						microtime(true) - $profile_stage
 					);
@@ -2258,7 +2258,7 @@ public function save() {
 		 * @param bool       $is_new If this object is a new one.
 		 */
 		$profile_stage = microtime(true);
-		do_action('wu_model_post_save', $this->model, $data, $data_unserialized, $this, $new); // @phpstan-ignore-line
+		do_action('wu_model_post_save', $this->model, $data, $data_unserialized, $this, $new);
 
 		/**
 		 * Fires after an object is stored into the database.
diff --git a/tests/WP_Ultimo/Helpers/Site_Duplicator_Postmeta_Test.php b/tests/WP_Ultimo/Helpers/Site_Duplicator_Postmeta_Test.php
index 7b6e665d..ddb9c3a6 100644
--- a/tests/WP_Ultimo/Helpers/Site_Duplicator_Postmeta_Test.php
+++ b/tests/WP_Ultimo/Helpers/Site_Duplicator_Postmeta_Test.php
@@ -444,6 +444,47 @@ public function test_all_postmeta_catch_all_does_not_overwrite_existing() {
 		restore_current_blog();
 	}
 
+	/**
+	 * Test that title fallback copies meta only when the target title is unique.
+	 */
+	public function test_all_postmeta_title_fallback_requires_unique_target_title() {
+		// Create a source post with an ID that will not exist on the target.
+		switch_to_blog($this->from_blog_id);
+		$page_id = self::factory()->post->create(
+			[
+				'import_id'  => 900001,
+				'post_type'  => 'page',
+				'post_title' => 'Ambiguous title fallback page',
+			]
+		);
+		update_post_meta($page_id, '_custom_field', 'source-value');
+		restore_current_blog();
+
+		// Create two target posts with the same type and title.
+		switch_to_blog($this->to_blog_id);
+		$first_target_id  = self::factory()->post->create(
+			[
+				'post_type'  => 'page',
+				'post_title' => 'Ambiguous title fallback page',
+			]
+		);
+		$second_target_id = self::factory()->post->create(
+			[
+				'post_type'  => 'page',
+				'post_title' => 'Ambiguous title fallback page',
+			]
+		);
+		restore_current_blog();
+
+		Testable_Site_Duplicator::backfill_all_postmeta($this->from_blog_id, $this->to_blog_id);
+
+		// Ambiguous title matches must not receive source metadata.
+		switch_to_blog($this->to_blog_id);
+		$this->assertEmpty(get_post_meta($first_target_id, '_custom_field', true));
+		$this->assertEmpty(get_post_meta($second_target_id, '_custom_field', true));
+		restore_current_blog();
+	}
+
 	/**
 	 * Test that backfill_all_postmeta only copies meta for posts that exist in target.
 	 */
diff --git a/tests/WP_Ultimo/Helpers/Site_Duplicator_Test.php b/tests/WP_Ultimo/Helpers/Site_Duplicator_Test.php
index f6eed0dc..00d4b70a 100644
--- a/tests/WP_Ultimo/Helpers/Site_Duplicator_Test.php
+++ b/tests/WP_Ultimo/Helpers/Site_Duplicator_Test.php
@@ -211,8 +211,8 @@ public function test_duplicate_invalid_source_site() {
 
 		$result = Site_Duplicator::duplicate_site($invalid_site_id, 'New Site', $args);
 
-		// The result should be either a WP_Error or a failure case
-		$this->assertTrue(is_wp_error($result) || ! $result || is_int($result));
+		$this->assertInstanceOf(\WP_Error::class, $result);
+		$this->assertSame('source_template_site_not_found', $result->get_error_code());
 	}
 
 	/**