diff --git a/distribution/ReleaseNotes.txt b/distribution/ReleaseNotes.txt
index 09451fd65..778f4091e 100644
--- a/distribution/ReleaseNotes.txt
+++ b/distribution/ReleaseNotes.txt
@@ -9,6 +9,7 @@ HEAD, planned as v0.24
 - The octal number format was added.
 - A push button combined with LED was added.
 - A VGA monitor was added.
+- Unnamed Tunnels are ignored silently.
 
 v0.23, released on 23. Aug. 2019
 - Added generic circuits. Now it is possible to parameterize a sub circuit.
diff --git a/src/main/java/de/neemann/digital/draw/model/NetList.java b/src/main/java/de/neemann/digital/draw/model/NetList.java
index 5ed6218d4..5c19ccba4 100644
--- a/src/main/java/de/neemann/digital/draw/model/NetList.java
+++ b/src/main/java/de/neemann/digital/draw/model/NetList.java
@@ -34,21 +34,23 @@ public class NetList implements Iterable<Net> {
         boolean hasLabel = false;
         for (VisualElement ve : circuit.getElements())
             if (ve.equalsDescription(Tunnel.DESCRIPTION)) {
-                Vector pos = ve.getPos();
-                Net found = null;
-                for (Net n : netList)
-                    if (n.contains(pos))
-                        found = n;
-
                 String label = ve.getElementAttributes().get(Keys.NETNAME).trim();
-                if (found == null) {
-                    final PinException e = new PinException(Lang.get("err_labelNotConnectedToNet_N", label), ve);
-                    e.setOrigin(circuit.getOrigin());
-                    throw e;
-                }
+                if (!label.isEmpty()) {
+                    Vector pos = ve.getPos();
+                    Net found = null;
+                    for (Net n : netList)
+                        if (n.contains(pos))
+                            found = n;
 
-                found.addLabel(label);
-                hasLabel = true;
+                    if (found == null) {
+                        final PinException e = new PinException(Lang.get("err_labelNotConnectedToNet_N", label), ve);
+                        e.setOrigin(circuit.getOrigin());
+                        throw e;
+                    }
+
+                    found.addLabel(label);
+                    hasLabel = true;
+                }
             }
 
         if (hasLabel)
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index 4d03e3575..dd0c85b06 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -298,7 +298,7 @@
     <string name="elem_Tunnel">Tunnel</string>
     <string name="elem_Tunnel_tt">Verbindet Elemente, ohne eine Leitung zu ziehen. Alle Tunnelelemente, welche denselben
         Netznamen tragen, sind miteinander verbunden. Der Tunnel ist immer lokal, es können keine Verbindungen über
-        Schaltungsgrenzen hinaus erzeugt werden.</string>
+        Schaltungsgrenzen hinaus erzeugt werden. Unbenannte Tunnel haben keine Funktion.</string>
     <string name="elem_Tunnel_pin_in">Anschluss des Tunnels.</string>
     <string name="elem_Splitter">Splitter</string>
     <string name="elem_Splitter_tt">Führt mehrere Leitungen zu einem gemeinsamen Bus zusammen, bzw. splittet diesen wieder auf.
diff --git a/src/main/resources/lang/lang_en.xml b/src/main/resources/lang/lang_en.xml
index ad370d50b..f079a5e6f 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -302,7 +302,8 @@
     <string name="elem_Const_pin_out">Returns the given value as a constant.</string>
     <string name="elem_Tunnel">Tunnel</string>
     <string name="elem_Tunnel_tt">Connects components without a wire. All tunnel elements, which have the same net name,
-        are connected together. Works only locally, so it is not possible to connect different circuits.</string>
+        are connected together. Works only locally, so it is not possible to connect different circuits.
+        Unnamed tunnels are ignored silently.</string>
     <string name="elem_Tunnel_pin_in">The connection to the tunnel.</string>
     <string name="elem_Splitter">Splitter</string>
     <string name="elem_Splitter_tt">Splits or creates a wire bundle or a data bus with more than one bit.