diff --git a/app/Http/Controllers/ProgramConstructController.php b/app/Http/Controllers/ProgramConstructController.php
index edf0e88..f9881f1 100644
--- a/app/Http/Controllers/ProgramConstructController.php
+++ b/app/Http/Controllers/ProgramConstructController.php
@@ -110,7 +110,7 @@ class ProgramConstructController extends BaseController
                 $program->name = trim($match["content"]);
                 $video_pivot = new ProgramVideos();
                 $video_pivot->video_bvid = $bvid;
-                $video_pivot->start_part = $match["part"] ?? 1;
+                $video_pivot->start_part = empty($match["part"]) ? 1 : $match["part"];
                 $video_pivot->start_time = $time;
                 $program->save();
                 $program->video_pivots()->save($video_pivot);