diff --git a/Tools/ModelTranslator/bl_decimate.py b/Tools/ModelTranslator/bl_decimate.py
index 25b2f3c0..ce28d707 100644
--- a/Tools/ModelTranslator/bl_decimate.py
+++ b/Tools/ModelTranslator/bl_decimate.py
@@ -166,7 +166,7 @@ def _unwrap_seam(obj, warnings, seam_angle_deg=SEAM_ANGLE_DEG):
         warnings.append("minimize_stretch 不可用（%s），跳过松弛" % e)
     try:  # 统一纹素密度，避免大岛霸占分辨率
         bpy.ops.uv.average_islands_scale()
-    except RuntimeError as e:
+    except (RuntimeError, TypeError) as e:
         warnings.append("average_islands_scale 不可用（%s），跳过纹素均衡" % e)
     try:
         bpy.ops.uv.pack_islands(rotate=True, margin=PACK_MARGIN)
diff --git a/Tools/ModelTranslator/model_decimate.py b/Tools/ModelTranslator/model_decimate.py
index 60aa2b94..d851ae4c 100644
--- a/Tools/ModelTranslator/model_decimate.py
+++ b/Tools/ModelTranslator/model_decimate.py
@@ -40,10 +40,12 @@ def main():
             with open(s["uv_polys"], encoding="utf-8") as fp:
                 polys = _json.load(fp)
             render_uv_png(polys, s["uv_preview"])
-            os.remove(s["uv_polys"])
             print("  UV 观察图: %s" % s["uv_preview"])
         except Exception as e:
             print("  [警告] UV 观察图渲染失败：%s" % e)
+        finally:  # sidecar 是内部临时文件，无论渲染成败都清掉
+            if os.path.exists(s["uv_polys"]):
+                os.remove(s["uv_polys"])
     for w in s["warnings"]:
         print("  [警告] %s" % w)