failure in ob-ipython--configure-kernel - symbol names and values

Using the ipython layer from spacemacs, I'm getting errors since last update (today). One concerns ob-ipython, with this stacktrace:
```Debugger entered--Lisp error: (wrong-type-argument stringp sh)
intern(sh)
ob-ipython--configure-kernel(("bash" . "bash"))
mapcar(ob-ipython--configure-kernel (("javascript" . "javascript") ("bash" . "bash") ("sagemath" . "") ("python2" . "python") ("ir" . "R") ("clojure" . "clojure") ("octave" . "octave") ("julia-0.5" . "julia") ("python3" . "python") ("python2-sys" . "python")))
-map(ob-ipython--configure-kernel (("javascript" . "javascript") ("bash" . "bash") ("sagemath" . "") ("python2" . "python") ("ir" . "R") ("clojure" . "clojure") ("octave" . "octave") ("julia-0.5" . "julia") ("python3" . "python") ("python2-sys" . "python")))
ob-ipython-auto-configure-kernels()
run-hooks(change-major-mode-after-body-hook text-mode-hook outline-mode-hook org-mode-hook)
apply(run-hooks (change-major-mode-after-body-hook text-mode-hook outline-mode-hook org-mode-hook))
run-mode-hooks(org-mode-hook)
org-mode()
set-auto-mode-0(org-mode nil)
set-auto-mode()
normal-mode(t)
after-find-file(nil t)
find-file-noselect-1(# "~/Devlp/emacs/spacemacs/my-spacemacs-issues-and-solutions/my-spacemacs-issues.org" nil nil "~/Devlp/emacs/spacemacs/my-spacemacs-issues-and-solutions/my-spacemacs-issues.org" (27870367 2058))
find-file-noselect(#("/home/mich/Devlp/emacs/spacemacs/my-spacemacs-issues-and-solutions/my-spacemacs-issues.org" 0 90 (match-part "/home/mich/Devlp/emacs/spacemacs/my-spacemacs-issues-and-solutions/my-spacemacs-issues.org")))
mapcar(find-file-noselect (#("/home/mich/Devlp/emacs/spacemacs/my-spacemacs-issues-and-solutions/my-spacemacs-issues.org" 0 90 (match-part "/home/mich/Devlp/emacs/spacemacs/my-spacemacs-issues-and-solutions/my-spacemacs-issues.org"))))
(let* ((files (helm-marked-candidates)) (buffers (mapcar (quote find-file-noselect) files))) (spacemacs//helm-open-buffers-in-windows buffers))
(lambda (candidate) (let* ((files (helm-marked-candidates)) (buffers (mapcar (quote find-file-noselect) files))) (spacemacs//helm-open-buffers-in-windows buffers)))(#("/home/mich/Devlp/emacs/spacemacs/my-spacemacs-issues-and-solutions/my-spacemacs-issues.org" 0 90 (match-part "/home/mich/Devlp/emacs/spacemacs/my-spacemacs-issues-and-solutions/my-spacemacs-issues.org")))
helm-execute-selection-action-1()
helm-execute-selection-action()
helm-internal(helm-source-recentf nil nil nil nil "*helm recentf*" nil nil nil)
apply(helm-internal (helm-source-recentf nil nil nil nil "*helm recentf*" nil nil nil))
helm(helm-source-recentf nil nil nil nil "*helm recentf*" nil nil nil)
apply(helm (helm-source-recentf nil nil nil nil "*helm recentf*" nil nil nil))
helm(:sources helm-source-recentf :ff-transformer-show-only-basename nil :buffer "*helm recentf*")
helm-recentf()
funcall-interactively(helm-recentf)
call-interactively(helm-recentf nil nil)
command-execute(helm-recentf)
```
the error emits the message:
`debugger-eval-expression: Symbol’s value as variable is void: sh`

Actually when trying to initialize `'mode` variable, `#'intern` is called with a symbol name, whereas it expects a string. At this stage, all /cdr/ of the alist `org-src-lang-modes` are symbols.