diff --git a/code/Importer/IFC/IFCGeometry.cpp b/code/Importer/IFC/IFCGeometry.cpp
index d1c7aee19..7949f9a58 100644
--- a/code/Importer/IFC/IFCGeometry.cpp
+++ b/code/Importer/IFC/IFCGeometry.cpp
@@ -138,8 +138,9 @@ void ProcessPolygonBoundaries(TempMesh& result, const TempMesh& inmesh, size_t m
             }
         }
     }
-
-    ai_assert(outer_polygon_it != end);
+	if (outer_polygon_it == end) {
+		return;
+	}
 
     const size_t outer_polygon_size = *outer_polygon_it;
     const IfcVector3& master_normal = normals[std::distance(begin, outer_polygon_it)];