Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
  find-coding-systems-region-internal(nil nil)
  find-coding-systems-region(nil nil)
  find-coding-systems-string(nil)
  mm-url-form-encode-xwfu(nil)
  #[(data) "\301@!\302\301A!Q\207" [data mm-url-form-encode-xwfu "="] 4](("verbose"))
  mapconcat(#[(data) "\301@!\302\301A!Q\207" [data mm-url-form-encode-xwfu "="] 4] (("action" . "stop_on_copy") ("verbose") ("limit" . "100") ("stop_rev" . "") ("rev" . "47459") ("mode" . "stop_on_copy")) "&")
  mm-url-encode-www-form-urlencoded((("action" . "stop_on_copy") ("verbose") ("limit" . "100") ("stop_rev" . "") ("rev" . "47459") ("mode" . "stop_on_copy")))
  eww-submit()
  call-interactively(eww-submit nil nil)
  command-execute(eww-submit)