weird elisp crash backtrace

backtrace

Debugger entered--Lisp error: (wrong-type-argument char-or-string-p nil)
  insert(nil)
  (while (consp --cl-var--) (setq value (car --cl-var--) key (pop value)) (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n") (setq --cl-var-- (cdr --cl-var--)))
  (let* ((--cl-var-- 1password-passwords) (value nil) (key nil)) (while (consp --cl-var--) (setq value (car --cl-var--) key (pop value)) (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n") (setq --cl-var-- (cdr --cl-var--))) nil)
  (catch (quote --cl-block-nil--) (let* ((--cl-var-- 1password-passwords) (value nil) (key nil)) (while (consp --cl-var--) (setq value (car --cl-var--) key (pop value)) (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n") (setq --cl-var-- (cdr --cl-var--))) nil))
  (cl-block-wrapper (catch (quote --cl-block-nil--) (let* ((--cl-var-- 1password-passwords) (value nil) (key nil)) (while (consp --cl-var--) (setq value (car --cl-var--) key (pop value)) (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n") (setq --cl-var-- (cdr --cl-var--))) nil)))
  (block nil (let* ((--cl-var-- 1password-passwords) (value nil) (key nil)) (while (consp --cl-var--) (setq value (car --cl-var--) key (pop value)) (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n") (setq --cl-var-- (cdr --cl-var--))) nil))
  (loop for (key . value) in 1password-passwords do (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n"))
  (let ((1password-buffer (get-buffer-create "*1password*"))) (switch-to-buffer 1password-buffer) (erase-buffer) (loop for (key . value) in 1password-passwords do (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n")))
  eval-region(146 491 t (lambda (ignore) (goto-char 491) (quote (let ((1password-buffer (get-buffer-create "*1password*"))) (switch-to-buffer 1password-buffer) (erase-buffer) (loop for (key . value) in 1password-passwords do (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n"))))))  ; Reading at buffer position 322
  apply(eval-region (146 491 t (lambda (ignore) (goto-char 491) (quote (let ((1password-buffer (get-buffer-create "*1password*"))) (switch-to-buffer 1password-buffer) (erase-buffer) (loop for (key . value) in 1password-passwords do (message "key = [%s], keyval = [%s], value = [%s]" key (symbol-name key) value) (insert (1password-make-button (symbol-name key) value)) (insert "\n")))))))
  eval-defun-2()
  eval-defun(nil)
  call-interactively(eval-defun nil nil)