diff --git a/moveit_setup_assistant/src/tools/collision_linear_model.cpp b/moveit_setup_assistant/src/tools/collision_linear_model.cpp
index e7dbac4777..5e1115f68a 100644
--- a/moveit_setup_assistant/src/tools/collision_linear_model.cpp
+++ b/moveit_setup_assistant/src/tools/collision_linear_model.cpp
@@ -273,7 +273,16 @@ bool SortFilterProxyModel::lessThan(const QModelIndex& src_left, const QModelInd
     if (value_left == value_right)
       continue;
 
-    bool smaller = (value_left < value_right);
+    bool smaller{};
+    switch (value_left.type())
+    {
+      case QVariant::Int:
+        smaller = value_left.toInt() < value_right.toInt();
+        break;
+      default:
+        smaller = value_left.toString() < value_right.toString();
+        break;
+    }
     if (sort_orders_[i] == Qt::DescendingOrder)
       smaller = !smaller;
     return smaller;