Unable to get property 'mouseup' of undefined or null reference
Note that, this error was not occurring in 2015 Q3 version. Also I can't reproduce the issue if I remove the RadSpell control from the page.
For convenience, I am adding the lines of code related to RadSpell control. It would be of great help if someone can point out why this js error is occurring. Thanks in advance.
// called this function on spell check button click