diff --git a/src/main/capabilities/ftp.ts b/src/main/capabilities/ftp.ts
index d707fcd..e5a6012 100644
--- a/src/main/capabilities/ftp.ts
+++ b/src/main/capabilities/ftp.ts
@@ -111,7 +111,9 @@ register("FTP_CreateDir", async (ctx, node, args) => {
   const client = await requireClient(node.id);
   const dir = requireText(args, ["dirname"], "目录名", node.id);
   await client.ensureDir(dir);
-  client.cd(dir).catch(() => {});
+  // 创建后进入该目录；必须 await，否则下个节点的命令与本次 cd 并发，
+  // basic-ftp 会以 "task while another one is still running" 关闭客户端
+  await client.cd(dir).catch(() => {});
   ctx.log("已创建目录：" + dir, "info", node.id);
   return { created: true, dir };
 });
diff --git a/src/main/capabilities/windows-system.ts b/src/main/capabilities/windows-system.ts
index 0760bb5..d611206 100644
--- a/src/main/capabilities/windows-system.ts
+++ b/src/main/capabilities/windows-system.ts
@@ -87,6 +87,12 @@ register("System_SetInputMethodState", async (ctx, node, args) => {
 
 register("File_OpenFile", async (ctx, node, args) => {
   const p = reqText(args, ["path"], "文件夹路径", node.id);
-  await run("explorer.exe", [p], { windowsHide: true });
+  try {
+    await run("explorer.exe", [p], { windowsHide: true });
+  } catch (error) {
+    // explorer.exe 打开成功也会返回退出码 1（Windows 已知行为），仅路径不存在时才是真失败
+    const code = (error as { code?: unknown }).code;
+    if (code !== 1) throw error;
+  }
   return { opened: true, path: p };
 });
diff --git a/src/renderer/src/validation/flowValidation.ts b/src/renderer/src/validation/flowValidation.ts
index ab5d142..add8a85 100644
--- a/src/renderer/src/validation/flowValidation.ts
+++ b/src/renderer/src/validation/flowValidation.ts
@@ -56,7 +56,7 @@ export function validateFlow(flow: FlowDefinition, catalog: Catalog): FlowValida
   }
 
   const definedVars = new Set<string>([
-    ...flow.variables.map((item) => item.name),
+    ...(flow.variables ?? []).map((item) => item.name),
     ...flow.nodes.map((node) => node.options?.outputVar).filter(Boolean) as string[]
   ]);
   const variableRef = /\$\{\s*([A-Za-z_\u4e00-\u9fa5][\w\u4e00-\u9fa5]*)\s*(?:\.[A-Za-z_]\w*)?\s*\}/g;