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Hi,
thanks for the hint. Those messages are PHP notices (or warnings), that (in a perfect world) should not be generated. However, in some cases those messages are generated, mostly due to a lack of checking the presence of variables or something. Although those messages don't mean fatal errors (in most cases), they are usually ugly and you do not want to expose those to the visitors of your website (and in the worst case scenario, they can also be a security threat). So, on a production server, please switch off the PHP message output (there are some options in the php.ini). I am pretty sure that JCollection isn't the only component where you'll encounter such messages once in a while - but I try to avoid the generation of those warnings as much as possible.
HTH,
Thorsten.
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