Index: generic/nsf.c
===================================================================
diff -u -r5436dfb5604b3e72e758eda0ae8ba2561527f04d -r6a7f2da9861c9a04c3324b7f8bc23149aed5bcb7
--- generic/nsf.c	(.../nsf.c)	(revision 5436dfb5604b3e72e758eda0ae8ba2561527f04d)
+++ generic/nsf.c	(.../nsf.c)	(revision 6a7f2da9861c9a04c3324b7f8bc23149aed5bcb7)
@@ -7816,6 +7816,7 @@
   osPtr = GetObjectSystem(&cl->object);
   for (i = 0; i < oc; i++) {
     if (osPtr != GetObjectSystem(&scl[i]->object)) {
+      FREE(NsfClass**, scl);
       return NsfPrintError(interp, "class \"%s\" has different object system as class  \"%s\"",
 			   ClassName(cl), ClassName(scl[i]));
     }