diff --git a/src/main/java/ninja/javafx/smartcsv/fx/table/model/CSVModel.java b/src/main/java/ninja/javafx/smartcsv/fx/table/model/CSVModel.java
index 0cc3de0..182843f 100644
--- a/src/main/java/ninja/javafx/smartcsv/fx/table/model/CSVModel.java
+++ b/src/main/java/ninja/javafx/smartcsv/fx/table/model/CSVModel.java
@@ -105,7 +105,7 @@ public class CSVModel {
      * walks through the data and validates each value
      */
     private void revalidate() {
-        if (header != null) {
+        if (header != null && validator != null) {
             validator.isHeaderValid(header);
         }