Index: trunk/test/data/regress/12464/example.osm
===================================================================
--- trunk/test/data/regress/12464/example.osm	(revision 9693)
+++ trunk/test/data/regress/12464/example.osm	(revision 9693)
@@ -0,0 +1,4 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<osm version='0.6' upload='true' generator='JOSM'>
+  <node id='-30' action='modify' visible='true' lat='-22.36830614198' lon='-48.7442054335' />
+</osm>
Index: trunk/test/unit/org/openstreetmap/josm/data/validation/tests/UntaggedNodeTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/validation/tests/UntaggedNodeTest.java	(revision 9685)
+++ trunk/test/unit/org/openstreetmap/josm/data/validation/tests/UntaggedNodeTest.java	(revision 9693)
@@ -2,4 +2,5 @@
 package org.openstreetmap.josm.data.validation.tests;
 
+import static org.CustomMatchers.hasSize;
 import static org.CustomMatchers.isEmpty;
 import static org.junit.Assert.assertThat;
@@ -46,3 +47,19 @@
         }
     }
+
+    /**
+     * Non-regression test for <a href="https://josm.openstreetmap.de/ticket/12464">Bug #12464</a>.
+     * @throws Exception if an error occurs
+     */
+    @Test
+    public void testTicket12464() throws Exception {
+        test.initialize();
+        test.startTest(null);
+        try (InputStream fis = TestUtils.getRegressionDataStream(12464, "example.osm")) {
+            final DataSet ds = OsmReader.parseDataSet(fis, NullProgressMonitor.INSTANCE);
+            test.visit(ds.allPrimitives());
+            test.endTest();
+            assertThat(test.getErrors(), hasSize(1));
+        }
+    }
 }