validation error

ncaught TypeError: Cannot read property 'replace' of undefined

    at guiEscapeSelectorIfNeeded (grouperUi.js?ver=2.5.46:1123)

    at guiProcessAction (grouperUi.js?ver=2.5.46:1239)

    at guiProcessJsonResponse (grouperUi.js?ver=2.5.46:1097)

    at Object.success (grouperUi.js?ver=2.5.46:995)

    at fire (jquery.js:3049)

    at Object.fireWith [as resolveWith] (jquery.js:3161)

    at done (jquery.js:8236)

    at XMLHttpRequest.callback (jquery.js:8779)