Index: trunk/src/org/openstreetmap/josm/data/osm/visitor/paint/WireframeMapRenderer.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/osm/visitor/paint/WireframeMapRenderer.java	(revision 19573)
+++ trunk/src/org/openstreetmap/josm/data/osm/visitor/paint/WireframeMapRenderer.java	(revision 19574)
@@ -154,4 +154,8 @@
         BBox bbox = bounds.toBBox();
         Rectangle clip = g.getClipBounds();
+        // handle possible null value, see #24734
+        if (clip == null)
+            return;
+
         clip.grow(50, 50);
         viewClip = mapState.getViewArea(clip);