diff --git a/xs/src/libslic3r/IO/AMF.cpp b/xs/src/libslic3r/IO/AMF.cpp

index 7433762..42e6491 100644

--- a/xs/src/libslic3r/IO/AMF.cpp

+++ b/xs/src/libslic3r/IO/AMF.cpp

@@ -344,9 +344,13 @@ void AMFParserContext::endElement(const char *name)

     // Faces of the current volume:

     case NODE_TYPE_TRIANGLE:

         assert(m_object && m_volume);

-        m_volume_facets.push_back(atoi(m_value[0].c_str()));

-        m_volume_facets.push_back(atoi(m_value[1].c_str()));

-        m_volume_facets.push_back(atoi(m_value[2].c_str()));

+        if (strtoul(m_value[0].c_str(), nullptr, 10) < m_object_vertices.size() &&

+            strtoul(m_value[1].c_str(), nullptr, 10) < m_object_vertices.size() &&

+            strtoul(m_value[2].c_str(), nullptr, 10) < m_object_vertices.size()) {

+            m_volume_facets.push_back(atoi(m_value[0].c_str()));

+            m_volume_facets.push_back(atoi(m_value[1].c_str()));

+            m_volume_facets.push_back(atoi(m_value[2].c_str()));

+        }

         m_value[0].clear();

         m_value[1].clear();

         m_value[2].clear();