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[div wfd-id="155"]Dear Support,[div wfd-id="154"]I found out that $fname = $config['fieldname']; in \plugins\chronoforms\admin\chronoforms\functions\upload\upload_output.php in Line 148 can be NULL.
I strongly suggest to make a check before the foreach.
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Something like
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if(isset($fname) && is_array($fname) && sizeof($fname)>0){
 foreach($fname as $keysData => $dataname){

Best regards
Collie-IT

no, that should not be null, or you have some misconfig!
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are you using the upload action or the global upload files ?