diff --git a/server-rs/crates/api-server/src/tripo3d/image_source.rs b/server-rs/crates/api-server/src/tripo3d/image_source.rs
index cb7e5e499..5ab18fce1 100644
--- a/server-rs/crates/api-server/src/tripo3d/image_source.rs
+++ b/server-rs/crates/api-server/src/tripo3d/image_source.rs
@@ -136,6 +136,9 @@ where
     }
     resolved
         .object_key
+        // 空串 / 纯空白的对象键与缺字段同义：放进队列后才会在下载源图时失败，
+        // 那时任务已经提交并计费，正是这条预检要挡下的情况。
+        .filter(|key| !key.trim().is_empty())
         .ok_or_else(image_source_object_key_missing)
 }