diff --git a/app/service/home.js b/app/service/home.js
index d8eaf3b..2c77cbc 100644
--- a/app/service/home.js
+++ b/app/service/home.js
@@ -276,7 +276,7 @@ class HomeService extends Service {
             const where = { sn_number: form.sn_number };
             const SN = await ctx.model3.SNNumber.findOne({ where });
             if (!SN) {
-                ctx.app.middleware.utils.log('../../../unknownSNLog', form);
+                ctx.app.middleware.utils.log('../../../unknownSNLog', JSON.stringify(form));
                 return false;
             };
             const model = {
diff --git a/unknownSNLog/2026/4/30.txt b/unknownSNLog/2026/4/30.txt
new file mode 100644
index 0000000..505f763
--- /dev/null
+++ b/unknownSNLog/2026/4/30.txt
@@ -0,0 +1 @@
+[2026-4-30>>>9:40:40]>>>[object Object]