1 files changed, 2 insertions, 1 deletions
diff --git a/xs/src/libslic3r/PrintObject.cpp b/xs/src/libslic3r/PrintObject.cpp
index 9bf74bee7..475a320bf 100644
--- a/xs/src/libslic3r/PrintObject.cpp
+++ b/xs/src/libslic3r/PrintObject.cpp
@@ -1253,7 +1253,8 @@ void PrintObject::_slice()
                 goto end;
         delete layer;
         this->layers.pop_back();
-        this->layers.back()->upper_layer = nullptr;
+		if (! this->layers.empty())
+			this->layers.back()->upper_layer = nullptr;
     }
 end:
     ;