Index: /applications/editors/josm/plugins/smed/plugs/oseam/src/oseam/seamarks/SeaMark.java
===================================================================
--- /applications/editors/josm/plugins/smed/plugs/oseam/src/oseam/seamarks/SeaMark.java	(revision 28771)
+++ /applications/editors/josm/plugins/smed/plugs/oseam/src/oseam/seamarks/SeaMark.java	(revision 28772)
@@ -1283,4 +1283,5 @@
 
 	public boolean testValid() {
+		if (dlg.node == null) return false;
 		boolean tmp = false;
 		dlg.manager.showVisualMessage("");