keep getting this: {"aID":"521","arHandle":"Main","cID":"171","error":false,"bID":"1015"}

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I'm using a stack within and html block type. Inside the html I'm using jquery to grab the id from an image and then use the data as part of a href.

When saving the block though I receive the following output on a blank white page: {"aID":"521","arHandle":"Main","cID":"171","error":false,"bID":"1015"}

The code still works ok but I'd prefer to find out why this is happening.