Thin white halo around objects

After I outline strokes or text I get a white halo, kind of looks like a thin stroke, around the object after I place it over a colored background. It's not a stroke though. Is there any way to fix this problem?

It might not actually be there, it might just be illy showing you the edge of the item, it's "kind" like that sometimes. Press CTRL+SHIFT+ALT+S (web export) and take a look, or switch it to pixel preview. I use the web export to check when I see odd things like that.
Regards
Paul

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