diff --git a/src/net/ApiCall.cpp b/src/net/ApiCall.cpp
index 5ef287e..a23d9ed 100644
--- a/src/net/ApiCall.cpp
+++ b/src/net/ApiCall.cpp
@@ -6,13 +6,16 @@
 namespace geopro::net {
 
 ApiCall::ApiCall(QNetworkReply* reply, QObject* parent) : IApiCall(parent), reply_(reply) {
+    Q_ASSERT(reply);                            // 契约：不接受 null reply（NAM get/post 正常不返回 null）
     QObject::connect(reply_, &QNetworkReply::finished, this, &ApiCall::onFinished);
 }
 
 void ApiCall::onFinished() {
     if (aborted_) return;                       // §5.0 入口守卫：迟到信号闸门
-    ApiResponse resp = buildResponse(reply_);
-    if (reply_) reply_->deleteLater();
+    QNetworkReply* reply = reply_.data();       // 快照：意图明确 + 防御 reply_ 中途被置空
+    if (!reply) return;
+    ApiResponse resp = buildResponse(reply);
+    reply->deleteLater();
     emit finished(resp);
     deleteLater();
 }