Index: trunk/src/org/openstreetmap/josm/gui/preferences/imagery/ImageryProvidersPanel.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/preferences/imagery/ImageryProvidersPanel.java	(revision 15152)
+++ trunk/src/org/openstreetmap/josm/gui/preferences/imagery/ImageryProvidersPanel.java	(revision 15153)
@@ -535,5 +535,5 @@
             outer:
             for (int line : lines) {
-                ImageryInfo info = defaultModel.getRow(line);
+                ImageryInfo info = defaultModel.getRow(defaultTable.convertRowIndexToModel(line));
 
                 // Check if an entry with exactly the same values already exists