Index: library/nx/nx.tcl
===================================================================
diff -u -r87e91761ab4117a6bbef6c0a77998c533d72b03f -r71a3245fb6a6e31e9188cf86d813f30cb8eb3ae7
--- library/nx/nx.tcl	(.../nx.tcl)	(revision 87e91761ab4117a6bbef6c0a77998c533d72b03f)
+++ library/nx/nx.tcl	(.../nx.tcl)	(revision 71a3245fb6a6e31e9188cf86d813f30cb8eb3ae7)
@@ -1278,11 +1278,13 @@
 	if {[${:domain} ::nsf::methods::object::info::method exists ${:name}]} {
 	  ::nsf::method::delete ${:domain} -per-object ${:name}
 	}
+      } elseif {[::nsf::is class ${:domain}]} {
+        ::nsf::parameter::cache::classinvalidate ${:domain}
+        if {[${:domain} ::nsf::methods::class::info::method exists ${:name}]} {
+          ::nsf::method::delete ${:domain} ${:name}
+        }
       } else {
-	::nsf::parameter::cache::classinvalidate ${:domain}
-	if {[${:domain} ::nsf::methods::class::info::method exists ${:name}]} {
-	  ::nsf::method::delete ${:domain} ${:name}
-	}
+        nsf::log Warning "ignore inproper domain ${:domain} during destroy (maybe per-object not set?)"
       }
     }
     ::nsf::next