Strange JavaScript red window error

[Mohammad]

Consider this small macro using stateTitle and stateIndex for reveal widget!

\define toggle-button(stateTiddler:"$:/state/toggle", stateIndex:"status", class:"")
<$reveal type="nomatch" stateTitle=<<__stateTiddler__>> stateIndex=<<__stateIndex__>> text="open">
<$button setTitle=<<__stateTiddler__>> setIndex=<<__stateIndex__>> setTo="open" class="$class$">
Open</$button>
</$reveal>

<$reveal type="match" stateTitle=<<__stateTiddler__>> stateIndex=<<__stateIndex__>> text="open">
<$button setTitle=<<__stateTiddler__>> setIndex=<<__stateIndex__>> setTo="closed" class="$class$">
Closed</$button>
</$reveal>
\end

No try the below example

<<toggle-button stateTiddler:"myTid" stateIndex:"xx">>

While you are in preview mode, try to change the stateIndex from "xx" to something else like "xx2"

The JS redwindow will be appeared!

If you donot use stateIndex and stateTitle and go through traditional state attribute, everything works fine!

--Mohammad