Example code:
\define re() (color)|(colour)ed
\define str() Something coloured
{{{ [<str>splitregexp<re>] }}}
The error is: Linked List only accepts string values, not undefined
Occurs in Chromium-based browsers (at least Brave) on https://tiddlywiki.com and https://tiddlywiki.com/empty.html, and on TiddlyDesktop with an empty TW. (Windows 10)
Also occurs in prerelease.