[ESS] Debugger entered--Lisp error

[Leo]

In an R buffer, C-M-a to get the following error:

Debugger entered--Lisp error: (error "Point is not in a function according to 'ess-function-pattern'.")
  signal(error ("Point is not in a function according to 'ess-function-pattern'."))
  error("Point is not in a function according to 'ess-function-pattern'.")
  ess-beginning-of-function()
  call-interactively(ess-beginning-of-function nil nil)

It is fine for this command to behave like this but there are call-sites
where this error gets in the way such as `ess-calculate-indent' which
hurts indentation.

Leo