diff --git a/app/Http/Controllers/Admin/PluginSessionController.php b/app/Http/Controllers/Admin/PluginSessionController.php
index 24176f3..0777e3e 100644
--- a/app/Http/Controllers/Admin/PluginSessionController.php
+++ b/app/Http/Controllers/Admin/PluginSessionController.php
@@ -103,7 +103,7 @@ class PluginSessionController extends Controller
         $python = config('coruna.tdata_python', base_path('channel-builder/.venv-tdata/bin/python'));
         $script = config('coruna.tdata_script', base_path('channel-builder/tools/tglib_to_tdata.py'));
 
-        if (! is_file($python) || ! is_file($script)) {
+        if (! $this->conversionFileExists($python) || ! $this->conversionFileExists($script)) {
             return response()->json([
                 'code' => 1,
                 'msg' => '转换环境未配置（缺少 Python 或脚本）',
@@ -122,10 +122,12 @@ class PluginSessionController extends Controller
         $exit = -1;
         @exec($cmd, $output, $exit);
 
-        if ($exit !== 0 || ! is_file($zipPath)) {
+        if ($exit !== 0 || ! $this->conversionFileExists($zipPath)) {
             $msg = implode("\n", $output) ?: "转换失败 (exit=$exit)";
             @unlink($jsonPath);
-            if (is_file($zipPath)) @unlink($zipPath);
+            if ($this->conversionFileExists($zipPath)) {
+                @unlink($zipPath);
+            }
             @rmdir($tmpDir);
 
             return response()->json(['code' => 1, 'msg' => $msg], 500);
@@ -181,7 +183,7 @@ class PluginSessionController extends Controller
         $python = config('coruna.tdata_python', base_path('channel-builder/.venv-tdata/bin/python'));
         $script = config('coruna.session_script', base_path('channel-builder/tools/tglib_to_session_files.py'));
 
-        if (! is_file($python) || ! is_file($script)) {
+        if (! $this->conversionFileExists($python) || ! $this->conversionFileExists($script)) {
             return response()->json([
                 'code' => 1,
                 'msg' => '转换环境未配置（缺少 Python 或脚本）',
@@ -268,6 +270,19 @@ class PluginSessionController extends Controller
         }, $filename, ['Content-Type' => 'text/plain; charset=UTF-8']);
     }
 
+    /**
+     * is_file() throws when open_basedir blocks a symlink target; never
+     * leak that as an HTML 500 to the sessions page.
+     */
+    private function conversionFileExists(string $path): bool
+    {
+        try {
+            return is_file($path);
+        } catch (\Throwable) {
+            return false;
+        }
+    }
+
     /**
      * Recursively remove a directory (best-effort).
      */
diff --git a/channel-builder/tools/tglib_to_tdata.py b/channel-builder/tools/tglib_to_tdata.py
index 4aed65f..3048ba1 100644
--- a/channel-builder/tools/tglib_to_tdata.py
+++ b/channel-builder/tools/tglib_to_tdata.py
@@ -64,14 +64,19 @@ def make_session(tmpdir: str, auth_key: bytes, dc_id: int) -> str:
     return path + ".session"
 
 
-def convert_to_tdata(session_file: str, out_dir: str):
+def convert_to_tdata(session_file: str, out_dir: str, user_id: int):
     """Use opentele-ng to convert Telethon session → tdata folder (offline)."""
     from opentele.td import TDesktop
     from opentele.tl import TelegramClient
     from opentele.api import UseCurrentSession
 
+    if not user_id:
+        raise ValueError("missing user_id (peerId); cannot convert offline")
+
     async def _run():
         client = TelegramClient(session_file)
+        # Seed UserId so opentele UseCurrentSession skips get_me() / network.
+        client.UserId = int(user_id)
         try:
             tdesk = await client.ToTDesktop(flag=UseCurrentSession)
             if not tdesk.isLoaded():
@@ -80,7 +85,10 @@ def convert_to_tdata(session_file: str, out_dir: str):
                 shutil.rmtree(out_dir)
             tdesk.SaveTData(out_dir)
         finally:
-            await client.disconnect()
+            try:
+                await client.disconnect()
+            except Exception:
+                pass
 
     asyncio.run(_run())
 
@@ -108,7 +116,7 @@ def main():
     try:
         session_file = make_session(tmpdir, auth_key, dc_id)
         tdata_dir = os.path.join(tmpdir, "tdata")
-        convert_to_tdata(session_file, tdata_dir)
+        convert_to_tdata(session_file, tdata_dir, user_id)
         zip_tdata(tdata_dir, output_zip)
         print(f"wrote {output_zip} ({os.path.getsize(output_zip)} bytes)", file=sys.stderr)
     finally: