error on search

[ladieman217]

when I search with keywords in chat room messages. sometimes I get the following error.

minimongo.js:53 Uncaught Error: Mod on id not allowed
at MinimongoError (minimongo.js:53)
at modify.js:49
at Function..each..forEach (underscore.js:113)
at modify.js:43
at Function..each._.forEach (underscore.js:113)
at Function.LocalCollection._modify (modify.js:36)
at LocalCollection._modifyAndNotify (minimongo.js:799)
at minimongo.js:717
at LocalCollection._eachPossiblyMatchingDoc (minimongo.js:604)
at LocalCollection.update (minimongo.js:712)
so,what is going on? ...thx