Something seems to have broken in a recent update to the Showdown server that causes battles to crash or fail starting. Here's the error as reported on the server, as well as the results of trying
Also see the errors posted by Staka in a comment below. This error appears to have worsened with time.
The error occurs for all battle formats. Could we get a fix? ...Pretty please?
EDIT 15/05: Pretty much every feature of the server is now broken, per the comments below.
/hotpatch all does nothing, as usual. Here is another lot of errors, from the Staff room (which is still working, for the time being):