diff --git a/src/main/java/de/neemann/digital/analyse/TruthTable.java b/src/main/java/de/neemann/digital/analyse/TruthTable.java
index b36928044..e969a5222 100644
--- a/src/main/java/de/neemann/digital/analyse/TruthTable.java
+++ b/src/main/java/de/neemann/digital/analyse/TruthTable.java
@@ -171,6 +171,7 @@ public class TruthTable implements Copyable<TruthTable> {
         variables.clear();
         variables.addAll(vars);
         results.clear();
+        bitSetter = null;
     }
 
     /**
diff --git a/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java b/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
index 83ea41e94..9767de692 100644
--- a/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
+++ b/src/main/java/de/neemann/digital/gui/components/table/TableDialog.java
@@ -212,11 +212,11 @@ public class TableDialog extends JDialog {
                         undoManager.apply(tt -> {
                             try {
                                 new ReorderInputs(tt, varNames).reorder();
-                                tableChanged();
                             } catch (ExpressionException ex) {
                                 throw new ModifyException("failed to reorder", ex);
                             }
                         });
+                        tableChanged();
                     } catch (ModifyException e1) {
                         new ErrorMessage().addCause(e1).show(TableDialog.this);
                     }
@@ -248,11 +248,11 @@ public class TableDialog extends JDialog {
                         undoManager.apply(tt -> {
                             try {
                                 new ReorderOutputs(tt, resultNames).reorder();
-                                tableChanged();
                             } catch (ExpressionException ex) {
                                 throw new ModifyException("failed to reorder", ex);
                             }
                         });
+                        tableChanged();
                     } catch (ModifyException e1) {
                         new ErrorMessage().addCause(e1).show(TableDialog.this);
                     }