diff --git a/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp b/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
index 8317b37..9620505 100644
--- a/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
+++ b/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
@@ -771,17 +771,19 @@ AcDbRegion *AecDbEwPipeBase::RegionFromCurvesDwgInFields(AcDbDwgFiler *pFiler, A
 				arRegPtrs.removeAt(nPos);
 			}
 
-			Acad::ErrorStatus es;
 			for (int j = 0;j < arRegPtrs.length();j++)
 			{
 				pRegion = (AcDbRegion*)arRegPtrs.at(j);
 
-				if (isRegionNull(pRegion) && isRegionNull(pRegionBig))
+				// 任一 region 无效就跳过，无效 region 参与布尔运算可能让 ACIS 崩溃
+				if (isRegionNull(pRegion) || isRegionNull(pRegionBig))
 				{
+					delete pRegion;
 					continue;
 				}
 
-				es = pRegionBig->booleanOper(AcDb::kBoolSubtract, pRegion);
+				rawBooleanOperWrapper(pRegionBig, pRegion, AcDb::kBoolSubtract);
+				delete pRegion;
 			}
 			return pRegionBig;
 		}