firebug jQuery internal error

firebug jQuery internal error

 I'm running a small jquery program, but before the browser even gets to it, the firebug console throws this error:

a.call is not a function


When I click on that I get this, which looks like jQuery itself is throwing the error. Is this just a firebug anomaly?

/packer/ JS compressor detected /* !eval(new String(function(p,a,c,k,e,r);)) */

/*
2 * jQuery 1.2.6 - New Wave Javascript
3 *
4 * Copyright (c) 2008 John Resig (jquery.com)