Ticket #17238: 17238.patch

src/org/openstreetmap/josm/actions/SaveActionBase.java

@@ -121 +121 @@
             }
             MainApplication.getMainFrame().repaint();
         } catch (IOException e) {
+            GuiHelper.runInEDT(() ->
+            JOptionPane.showMessageDialog(MainApplication.getMainFrame(), tr("Export failed: {0}", e.getMessage()), tr("Warning"),
+                    JOptionPane.WARNING_MESSAGE));
             Logging.error(e);
             return false;
         }