1 files changed, 3 insertions, 1 deletions
diff --git a/extern/carve/lib/intersect_face_division.cpp b/extern/carve/lib/intersect_face_division.cpp
index ea82b7e89a3..e826948128c 100644
--- a/extern/carve/lib/intersect_face_division.cpp
+++ b/extern/carve/lib/intersect_face_division.cpp
@@ -1121,7 +1121,9 @@ namespace {
         }
 
         // copy up to the end of the path.
-        std::copy(base_loop.begin() + pos, base_loop.begin() + e1_1, std::back_inserter(out));
+        if (pos < e1_1) {
+            std::copy(base_loop.begin() + pos, base_loop.begin() + e1_1, std::back_inserter(out));
+        }
 
         CARVE_ASSERT(base_loop[e1_1] == p1.back());
         std::copy(p1.rbegin(), p1.rend() - 1, std::back_inserter(out));