debugging - errors not shown in Firebug console with dojo/when promise -

newbie dojo. don't understand why js errors not written firebug console when happening in resolved promise handler of dojo/when function. synchronous code, errors written. when error happens, erroneous line shown in firebug script view. i'm using dojo 1.8 ff 19.0 , firebug 1.11.2.

there has try catch block somewhere along code, prevents dojo/when throw errors.

you can add functionality adding try catch block yourself, check out jsfiddle:

http://jsfiddle.net/kymkf/1/

    try{         should.bombandloganerrorinfirebug(); //this not log error in firebug! why?     } catch(e) {             alert("error");         }