Index: trunk/test/unit/org/openstreetmap/josm/gui/layer/OsmDataLayerTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/gui/layer/OsmDataLayerTest.java	(revision 14503)
+++ trunk/test/unit/org/openstreetmap/josm/gui/layer/OsmDataLayerTest.java	(revision 14504)
@@ -32,8 +32,10 @@
 import org.openstreetmap.josm.data.osm.Way;
 import org.openstreetmap.josm.gui.MainApplication;
+import org.openstreetmap.josm.gui.datatransfer.ClipboardUtils;
 import org.openstreetmap.josm.io.IllegalDataException;
 import org.openstreetmap.josm.io.OsmReader;
 import org.openstreetmap.josm.testutils.JOSMTestRules;
 import org.openstreetmap.josm.testutils.mockers.ExtendedDialogMocker;
+import org.openstreetmap.josm.tools.Logging;
 import org.openstreetmap.josm.tools.date.DateUtils;
 
@@ -310,5 +312,5 @@
      */
     @Test
-    public void testLayerNameIncreases() throws Exception {
+    public void testLayerNameIncreases() {
         final OsmDataLayer layer1 = new OsmDataLayer(new DataSet(), OsmDataLayer.createLayerName(147), null);
         final OsmDataLayer layer2 = new OsmDataLayer(new DataSet(), OsmDataLayer.createNewName(), null);
@@ -334,3 +336,14 @@
         assertEquals("Data Layer from GeoJSON: foo.geojson", layer.getName());
     }
+
+    /**
+     * Non-regression test for ticket <a href="https://josm.openstreetmap.de/ticket/17065">#17065</a>.
+     */
+    @Test
+    public void testTicket17065() {
+        ClipboardUtils.clear();
+        Logging.clearLastErrorAndWarnings();
+        new OsmDataLayer(new DataSet(), null, null).destroy();
+        assertTrue(Logging.getLastErrorAndWarnings().stream().noneMatch(s -> s.contains("UnsupportedFlavorException")));
+    }
 }