Index: generic/nsfObj.c
===================================================================
diff -u -r8e0b30355e24d03a7baba8b701cbab2aa7694157 -r5163190ade6f6a2abcd8b7f0265f74457557a61c
--- generic/nsfObj.c	(.../nsfObj.c)	(revision 8e0b30355e24d03a7baba8b701cbab2aa7694157)
+++ generic/nsfObj.c	(.../nsfObj.c)	(revision 5163190ade6f6a2abcd8b7f0265f74457557a61c)
@@ -499,12 +499,16 @@
     Mixinreg *mixinRegPtr = obj->internalRep.twoPtrValue.ptr1;
 
     /*
-     * We got a cmd, but this might be already deleted.
+     * We got a mixin with an included cmd, but both might be already deleted.
      */
-    if ((Tcl_Command_flags(mixinRegPtr->mixin->object.id) & CMD_IS_DELETED)) {
+    if ((mixinRegPtr->mixin->object.flags & NSF_DELETED) != 0U
+        || (Tcl_Command_flags(mixinRegPtr->mixin->object.id) & CMD_IS_DELETED) != 0U) {
+
       /*
        * The cmd is deleted. retry to refetch it.
        */
+      /*fprintf(stderr, "... we have to refetch \n");*/
+
       if (MixinregSetFromAny(interp, obj) == TCL_OK) {
 	mixinRegPtr = obj->internalRep.twoPtrValue.ptr1;
       } else {
@@ -514,6 +518,7 @@
 
     *guardObj = mixinRegPtr->guardObj;
     *clPtr = mixinRegPtr->mixin;
+
     return TCL_OK;
   }