diff --git a/utils/hook.py b/utils/hook.py
index 8230a91..76777e6 100644
--- a/utils/hook.py
+++ b/utils/hook.py
@@ -18,11 +18,23 @@ from datetime import datetime
 
 
 def gen_build_info():
-    hash_str = subprocess.check_output(['git', 'rev-parse', '--short', 'HEAD']).decode('utf-8').strip()
+    try:
+        hash_str = subprocess.check_output(
+            ['git', 'rev-parse', '--short', 'HEAD'],
+            stderr=subprocess.DEVNULL
+        ).decode('utf-8').strip()
+    except FileNotFoundError:
+        # git 未安装
+        hash_str = 'unknown'
+    except subprocess.CalledProcessError:
+        # 不是 git 仓库（如从压缩包下载）
+        hash_str = 'unknown'
+
     with open('build_info.py', 'w', encoding='utf-8') as f:
         f.write(f"# Auto-generated build info\n")
         f.write(f"BUILD_TIME = '{datetime.now().isoformat(sep=' ', timespec='seconds')}'\n")
         f.write(f"GIT_HASH = '{hash_str}'\n")
 
 
-gen_build_info()
+if __name__ == '__main__':
+    gen_build_info()