Type mismatch error when selecting TMAX NGroup Menu in TEdit

[pamoroso]

Describe the bug

In TEdit with TMAX loaded, when I select the NGroup Menu item of TEdit's middle-click menu I get a break window with the error:

TYPE-MISMATCH
In \DTEST.UFN:
(NIL) is not a HASH-TABLE.

To Reproduce

Steps to reproduce the behavior:

1. launch Medley
2. evaluate (FILESLOAD TMAX)
3. open TEdit
4. from the middle-click menu of TEdit's title bar, select TMAX Menu > NGroup Menu

Expected behavior

The NGroup menu graph is displayed in a window with no error.

Screenshots

The break window:

The desktop:

Context (please complete the following information):

• Are you using online.interlisp.org? no
• OS: Linux
• OS Version: Mint 22.1 Cinnamon
• Display/window system: X11/VNC
• Host arch: x86_64 (System76 Merkaat)
• Maiko version: d791b1d
• IL:MAKESYSDATE: 17-Mar-2026 04:07:54 (Maiko: master/d791b1d); Medley: master/13eb940)

Additional context

The stack trace:

TEDIT.DEFAULT.MENUFN/6(debug)BTV
PUTHASH
   NEW.GROUPID NEW.NGROUP
   TEMPLATE NIL
   DEPENDENT.CLASS NIL
   FONT NIL
   NGROUP.NODE (NEW.NGROUP NIL NIL NIL NIL NIL NIL 
NIL NIL {HELVETICA10-BRR/171,155524} --)
   TSTREAM #<IO Tedit Stream/137,10500>
   NGROUP.ARRAY NIL
ADD.NGROUP.TO.DBASE
   TSTREAM #<IO Tedit Stream/137,10500>
   ROOTNODE (NEW.NGROUP NIL NIL NIL NIL NIL NIL NIL 
NIL {HELVETICA10-BRR/171,155524} --)
   NODELST ((NEW.NGROUP NIL NIL NIL NIL NIL NIL NIL 
NIL --))
INITIAL.NGROUP.GRAPH
   TSTREAM #<IO Tedit Stream/137,10500>
GRAPHMENU
   SI::*CLEANUP-FORMS* SI::RESETUNWIND
SI::*UNWIND-PROTECT*
   SI::*DUMMY-FOR-CATCH* T
   SI::*CATCH-RETURN-FROM* (&)
   LISPXHIST NIL
   SI::*RESETFORMS* ((& {TEXTOBJ}#121,64600))
   RESETSTATE NIL
TEDIT.DEFAULT.MENUFNA0001
   PANE {WINDOW}#121,66570
   TSTREAM #<IO Tedit Stream/137,10500>
   TEXTOBJ {TEXTOBJ}#121,64600
   WMENU NIL
   ITEM GRAPHMENU
   THISMENU {MENU}#146,7540
   SI::NLSETQ-VALUE NIL
   *PROCEED-CASES* (&)
   SI::*NLSETQFLAG* NIL
TEDIT.DEFAULT.MENUFN
   *FORM* (TEDIT.DEFAULT.MENUFN (QUOTE {WINDOW}#121,
66570))
   *ARGVAL* NIL
   *TAIL* NIL
   *FN* TEDIT.DEFAULT.MENUFN
\EVALFORM
   %#FORM# (TEDIT.DEFAULT.MENUFN (QUOTE {WINDOW}#121,
66570))
   *CURRENT-PROCESS* 
#<Process TEDIT.DEFAULT.MENUFN/121,53614>
   HELPFLAG BREAK!
   \CURRENTDISPLAYLINE 0
   \#DISPLAYLINES 40
   \LINEBUF.OFD #<IO Stream on T/172,24500>
   *READTABLE* #<ReadTable INTERLISP/172,23714>
   \PRIMTERMTABLE {TERMTABLEP}#172,16740
   \PRIMTERMSA {CHARTABLE}#172,17000
   TtyDisplayStream 
#<Output Display Stream/137,15300>
   SI::*RESETFORMS* NIL
   \INTERRUPTABLE T
   \TTYWINDOW NIL
   READBUF NIL
   \TERM.OFD #<Output Stream on T/166,103600>
   *STANDARD-OUTPUT* #<Output Stream on T/166,103600>
   *STANDARD-INPUT* #<IO Stream on T/172,24500>
\MAKE.PROCESS0
T