Error when data is output via ajax when GZIP enabled

[eluser]codedrunk[/eluser]
Firebug is showing that my desired output is in fact generated, but right behind it is an error message:

Code:

<b>Fatal error</b>:  ob_start() [&lt;a href='ref.outcontrol'&gt;ref.outcontrol&lt;/a&gt;]: Cannot use

output buffering in output buffering display handlers in <b>/var/www/CI/system/libraries/Exceptions

.php</b> on line <b>160</b><br />

I'm guessing it's because the data is just echo'd out rather than through CI's output method?

Does anyone know how I would be able to fix this?

Thanks in advance!