[tbworld]

I believe your code warning is about line 295. So edit that file and on line 294 put.

var_dump($awc_goal['extra']);  die(__FILE__.__LINE__);

This will display to the screen then php will die.

This may not give us the any useful data as the error may not have occurred as of yet. In fact it probably did not, but lets see what it says first.
The buffered var_dump code you found is important ... but hold off. Maybe you will get lucky.

Then try moving die to the end of loop so that you display more data. The data may end up being positioned all over your screen. Normally we write this data to an external file or an array.