bug#20838: 25.0.50; Lisp error: (wrong-type-argument listp :error) when refreshing the package list

[Artur Malabarba]

Fixed by d6dd70b * lisp/emacs-lisp/package.el (package--with-work-buffer-async):

2015-06-17 16:47 GMT+01:00 Glenn Morris <rgm@gnu.org>:
> Tassilo Horn wrote:
>
>> Since recently, I get the following error when refreshing the package
>> list (M-x list-packages RET).
>>
>> --8<---------------cut here---------------start------------->8---
>> Debugger entered--Lisp error: (wrong-type-argument listp :error)
>>   #[257 "\211@\304=\203..\305\303!\203..\303 
>> \210\306.@A.AA\"\210\202?.eb\210\307\310\311\312#\204,.\313\314p\"\210e`|\210\315\316
>>  \302\301#\300\203>.\300.!\210\210\317p!\207" [#[256 
>> "\211\204..\f\305=\204..\306\300!\210\307\310\301\"\210\311\302\312\303\312\313%\210\211\203-.\311\314\315.\316#\312\303\317P\312\313%\210\306\300!\207"
>>  [("melpa" . "http://melpa.org/packages/";) "melpa" "\n(1 (zygospore . 
>> [(20140703 152) nil \"reversible C-x 1 (delete-other-windows)\" single 
>> ((:url . \"https://github.com/louiskottmann/zygospore.el\";))]) (ztree . 
>> [(20150613 1328) nil \"Text mode directory tree\" tar ((:keywords \"files\" 
>> \"
> tools\") (:url . \"https://github.com/fourier/ztree\";))]) (zotxt .
> [(20150603 2017) ((request-deferred (0 2 0))) \"Tools to integrate emacs
> with Zotero via the zotxt plugin.\" tar nil]) (zotelo . [(20150531 1225)
> nil \"Manage Zotero coll
>
>
> Snip truly enormous backtrace which was far too large to send out to
> bug-gnu-emacs. Interested parties can see the full report at
> http://debbugs.gnu.org/20838
>
>
>