Index: /trunk/src/org/openstreetmap/josm/gui/preferences/imagery/AddWMSLayerPanel.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/preferences/imagery/AddWMSLayerPanel.java	(revision 13414)
+++ /trunk/src/org/openstreetmap/josm/gui/preferences/imagery/AddWMSLayerPanel.java	(revision 13415)
@@ -87,5 +87,5 @@
                         tr("WMS Error"), JOptionPane.ERROR_MESSAGE);
             } catch (WMSImagery.WMSGetCapabilitiesException ex3) {
-                String incomingData = ex3.getIncomingData().trim();
+                String incomingData = ex3.getIncomingData() != null ? ex3.getIncomingData().trim() : "";
                 String title = tr("WMS Error");
                 StringBuilder message = new StringBuilder(tr("Could not parse WMS layer list."));