diff --git a/lib/Projectrans/Phase2Translator.py b/lib/Projectrans/Phase2Translator.py
index 42322f4..2b5e6f2 100644
--- a/lib/Projectrans/Phase2Translator.py
+++ b/lib/Projectrans/Phase2Translator.py
@@ -1561,7 +1561,10 @@ class Phase2Translator:
         old_stub_count = len(self.stub_files)
         old_sig_count = len(self.sig_files)
         self.stub_files = {k: v for k, v in self.stub_files.items() if k in valid_sha1s}
-        self.sig_files = {k: v for k, v in self.sig_files.items() if k in valid_sha1s}
+        # sig_files 不能按 sha1_map（仅 App 源文件）过滤：include 模块的 .vpi
+        # 也必须保留，否则跨模块 extern（ReadProcessMemory / StackWalk64 等）
+        # 无法识别为裸名，链接时报 undefined symbol。
+        self.sig_files = {k: v for k, v in self.sig_files.items() if os.path.isfile(v)}
         if old_stub_count != len(self.stub_files) or old_sig_count != len(self.sig_files):
             _vlog().info(f"过滤旧文件: stub {old_stub_count}->{len(self.stub_files)}, sig {old_sig_count}->{len(self.sig_files)}")