Resolve TypeError

I'm running Mac OSX 10.8 and I occasionally get the following error when I open a JS file:

    Error detected while processing function <SNR>34_JSLint: 
    Exception: TypeError: Attempted to assign to readonly property.^@ultimate@jslint-core.js:2553^@@jslint-core.js:3165^@global code@jslint-core.js:6392^@ could not invoke JSLint!

Removing line 2553 solved the issue and going through the code it wasn't being used anywhere either.