Index: /trunk/src/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModel.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModel.java	(revision 9631)
+++ /trunk/src/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModel.java	(revision 9632)
@@ -441,5 +441,6 @@
 
     RelationMember getRelationMemberForPrimitive(final OsmPrimitive primitive) {
-        final Collection<TaggingPreset> presets = TaggingPresets.getMatchingPresets(EnumSet.of(TaggingPresetType.forPrimitive(relation)),
+        final Collection<TaggingPreset> presets = TaggingPresets.getMatchingPresets(
+                EnumSet.of(relation != null ? TaggingPresetType.forPrimitive(relation) : TaggingPresetType.RELATION),
                 presetHandler.getSelection().iterator().next().getKeys(), false);
         Collection<String> potentialRoles = new TreeSet<>();
Index: /trunk/test/unit/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModelTest.java
===================================================================
--- /trunk/test/unit/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModelTest.java	(revision 9632)
+++ /trunk/test/unit/org/openstreetmap/josm/gui/dialogs/relation/MemberTableModelTest.java	(revision 9632)
@@ -0,0 +1,49 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.dialogs.relation;
+
+import static org.junit.Assert.assertNotNull;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.openstreetmap.josm.JOSMFixture;
+import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.Tag;
+import org.openstreetmap.josm.gui.tagging.presets.TaggingPresetHandler;
+
+/**
+ * Unit tests of {@link MemberTableModel} class.
+ */
+public class MemberTableModelTest {
+
+    /**
+     * Setup test.
+     */
+    @BeforeClass
+    public static void setUpBeforeClass() {
+        JOSMFixture.createUnitTestFixture().init();
+    }
+
+    /**
+     * Non-regression test for ticket <a href="https://josm.openstreetmap.de/ticket/12443">#12443</a>.
+     */
+    @Test
+    public void testTicket12443() {
+        final Node n = new Node(1);
+        assertNotNull(new MemberTableModel(null, null, new TaggingPresetHandler() {
+            @Override
+            public void updateTags(List<Tag> tags) {
+                // Do nothing
+            }
+
+            @Override
+            public Collection<OsmPrimitive> getSelection() {
+                return Collections.<OsmPrimitive>singleton(n);
+            }
+        }).getRelationMemberForPrimitive(n));
+    }
+}