Unexpected runtime error

The runtime has encountered an unexpected error.

Error source

Page Name:/blogSearch.xsp
Control Id: inputRichText1

Exception

Error while executing JavaScript computed expression
Błąd interpretera skryptów (wiersz = 1, kolumna = 23): Element rowData.getDocument() ma wartość NULL

JavaScript code

   1: rowData.getDocument().getItemValue('EntryText')

Stack Trace