Attempt to delete minibuffer or sole ordinary window

[TSUCHIYA Masatoshi <tsuchiya@xxxxxxxxxxxxxxxxxxxxxxx>]

他力本願モード．

  (setq w3m-pop-up-windows nil
        w3m-pop-up-frames nil)

という設定で，

  (1) C-x 1
  (2) M-x w3m RET
  (3) C-x 5 2
  (4) q

すると，表題の error になります．backtrace は末尾に添付した通りです．
現象としては理解できますが，どう直したらいいのか…．

-- 
土屋 雅稔 ( TSUCHIYA Masatoshi )

Debugger entered--Lisp error: (error "Attempt to delete minibuffer or sole ordinary window")
  delete-window(#<window 75 on *w3m*>)
  (if (one-window-p t frame) nil (delete-window window))
  (unless (one-window-p t frame) (delete-window window))
  (if (and (eq frame w3m-initial-frame) (not ...)) (if (or ... ...) (delete-frame frame) (delete-window window)) (unless (one-window-p t frame) (delete-window window)))
  (progn (if (and ... ...) (if ... ... ...) (unless ... ...)))
  (if frame (progn (if ... ... ...)))
  (when frame (if (and ... ...) (if ... ... ...) (unless ... ...)))
  (while windows (setq window (pop windows) frame (window-frame window)) (when frame (if ... ... ...)))
  (while buffers (setq buffer (pop buffers) windows (get-buffer-window-list buffer ... t)) (set-buffer buffer) (while windows (setq window ... frame ...) (when frame ...)))
  (save-current-buffer (while buffers (setq buffer ... windows ...) (set-buffer buffer) (while windows ... ...)))
  (let ((buffers ...) buffer windows window frame flag) (save-current-buffer (while buffers ... ... ...)))
  w3m-delete-frames-and-windows()
  w3m-close-window()
  call-interactively(w3m-close-window)