diff --git a/src/main/java/de/neemann/digital/draw/library/LibraryNode.java b/src/main/java/de/neemann/digital/draw/library/LibraryNode.java
index 3310a52e7..65114caab 100644
--- a/src/main/java/de/neemann/digital/draw/library/LibraryNode.java
+++ b/src/main/java/de/neemann/digital/draw/library/LibraryNode.java
@@ -291,7 +291,7 @@ public class LibraryNode implements Iterable<LibraryNode> {
         if (isCustom()) {
             if (isUnique()) {
                 if (description == null)
-                    return null;
+                    return Lang.get("msg_fileNotImportedYet");
                 else
                     return StringUtils.textToHTML(description.getDescription(new ElementAttributes()));
             } else
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index 6f50f94cf..060532901 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -738,6 +738,7 @@ Die Icons stammen aus dem Tango Desktop Project.</string>
     <string name="msg_actualCircuit">Aktuelle Schaltung</string>
     <string name="msg_fileNotAccessible">Dieser Dateiename ist nicht aus dem aktuellen Projekt importierbar!</string>
     <string name="msg_fileIsNotUnique">Der Dateiname ist nicht eindeutig!</string>
+    <string name="msg_fileNotImportedYet">Die Datei wurde noch nicht importiert.</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 888e54a89..76f9bc351 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -725,6 +725,7 @@ The icons are taken from the Tango Desktop Project.</string>
     <string name="msg_actualCircuit">Actual Circuit</string>
     <string name="msg_fileNotAccessible">The selected file name is not importable from the actual project!</string>
     <string name="msg_fileIsNotUnique">The file name is not unique!</string>
+    <string name="msg_fileNotImportedYet">The file has not yet been imported.</string>
 
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>