diff --git a/src/views/vehicle/customer-archive.vue b/src/views/vehicle/customer-archive.vue
index a1bd50a..ba2af27 100644
--- a/src/views/vehicle/customer-archive.vue
+++ b/src/views/vehicle/customer-archive.vue
@@ -2544,7 +2544,9 @@ export default {
         const res = await querySupplierCode(code);
         // 防止响应返回时用户已修改代码
         if (String(this.archiveForm.unifiedCreditCode || '').trim().toUpperCase() !== code) return;
-        this.archiveForm.supplierCode = res?.data?.data || '';
+        // 后端查不到时 data 为 {}（R 对 null 的空承载兜底），非字符串一律按空处理，避免显示 [object Object]
+        const supplierCode = res?.data?.data;
+        this.archiveForm.supplierCode = typeof supplierCode === 'string' ? supplierCode : '';
       } catch (error) {
         // 忽略查询异常，编码留空
       }