diff --git a/src/main/java/de/neemann/digital/gui/Main.java b/src/main/java/de/neemann/digital/gui/Main.java
index 4831741f9..a43ea4a5d 100644
--- a/src/main/java/de/neemann/digital/gui/Main.java
+++ b/src/main/java/de/neemann/digital/gui/Main.java
@@ -1600,10 +1600,10 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
             SwingUtilities.invokeLater(() -> {
                 if (model != null && model.isRunning()) {
                     try {
-                        advanceSimulator.advance(Main.this);
+                        advanceSimulator.advance(model);
                         circuitComponent.graphicHasChanged();
                     } catch (Exception e) {
-                        showError("Message", e);
+                        showError(Lang.get("msg_errorSettingModelToTestCase"), e);
                     }
                 }
             });
@@ -2141,9 +2141,9 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
         /**
          * Advances the model to a certain state
          *
-         * @param main main
+         * @param model the model
          * @throws Exception Exception
          */
-        void advance(Main main) throws Exception;
+        void advance(Model model) throws Exception;
     }
 }
diff --git a/src/main/java/de/neemann/digital/gui/components/testing/ValueTableDialog.java b/src/main/java/de/neemann/digital/gui/components/testing/ValueTableDialog.java
index 68ef503b9..f2cfaae50 100644
--- a/src/main/java/de/neemann/digital/gui/components/testing/ValueTableDialog.java
+++ b/src/main/java/de/neemann/digital/gui/components/testing/ValueTableDialog.java
@@ -189,7 +189,7 @@ public class ValueTableDialog extends JDialog {
                     TestRow row = vtm.getRow(r);
                     if (owner instanceof Main) {
                         Main main = (Main) owner;
-                        main.startSimulation(m -> new TestExecutor(valueTableHolder.testCaseDescription, m.getModel()).executeTo(row.getRow()));
+                        main.startSimulation(m -> new TestExecutor(valueTableHolder.testCaseDescription, m).executeTo(row.getRow()));
                     }
                 }
             }
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index 71b2e76b6..8b1886c76 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -2004,6 +2004,7 @@ Stellen Sie sicher, dass der Flash-Vorgang abgeschlossen ist, bevor Sie diesen D
     <string name="btn_copyToClipboard_tt">Kopiert den Text in die Zwischenablage.</string>
 
     <string name="msg_supportsHDL">Exportierbar zu VHDL/Verilog.</string>
+    <string name="msg_errorSettingModelToTestCase">Fehler beim Setzen der Zeile des Testfalles.</string>
 
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>
diff --git a/src/main/resources/lang/lang_en.xml b/src/main/resources/lang/lang_en.xml
index bcf34adab..8729bd362 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -2017,6 +2017,7 @@
     <string name="msg_dataWillBeLost_n">Do you really want to discard the changes in the "{0}" field?</string>
 
     <string name="msg_supportsHDL">Exportable to VHDL/Verilog.</string>
+    <string name="msg_errorSettingModelToTestCase">Error while setting the test case row.</string>
 
     <string name="err_vgaModeNotDetected_N">Video mode was not detected ({0})</string>