diff --git a/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java b/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
index 464bdab..90da42e 100644
--- a/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
+++ b/src/main/java/ninja/javafx/smartcsv/fx/validation/ValidationEditorController.java
@@ -298,6 +298,7 @@ public class ValidationEditorController extends FXMLController {
         Constraints constraints = config.getConstraints();
         if (constraints == null) {
             constraints = new Constraints();
+            config.setConstraints(constraints);
         }
 
         if (enableNotEmptyRule.isSelected()) {