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I'm trying to log javascript errors on a productive site. So far it worked quite well with the following code included in the site: function catcherr(errorMessage, url, line) { var parameters = "msg=" + escape(errorMessage) + "&url=" + escape(url) + "&line=" + escape(line); new Image().src = "/error.gif?" + parameters; return false; }; window.onerror = catcherr; I'm trying to add a stack trace to the errors to get more information. This basically works with the following idea including into the function above: try { i.dont.exist += 0; } // does not exist - that's the point catch (e) { if (e.stack) // Firefox { // do some stuff I use jquery, a simple example: <script type="text/javascript"> jQuery(document).ready(function() { p.foo += 1; // this should throw an error // do stuff }); </script> The funny part is, that when I have an error inside the "ready" function of jquery, the part "try { i.dont.exist += 0; }" does not throw any exception anymore and the engine stops without any error. With the example above, and catcherr extended as follows, only "1" gets alerted: function catcherr(errorMessage, url, line) { try { alert(1); i.dont.exist += 0; alert(4);} catch(e) { alert(5);} alert(2); var parameters = "msg=" + escape(errorMessage) // ... } Anyone having an idea why this breaks, when an error occurs inside the "ready" function of jquery?

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