On my new installation (version 2.2.1) I had an issue with dynamic urls. When using a QR code with a dynamic url, the redirect ended in a mysql error page. Checking the error, I realised that the sql prefix is duplicated. The following change fixed the issue for me.
read.php - error
Line 16 - $db->update (DATABASE_PREFIX.'dynamic_qrcodes', $data);
read.php - fix
Line 16 - $db->update ("dynamic_qrcodes", $data);
On my new installation (version 2.2.1) I had an issue with dynamic urls. When using a QR code with a dynamic url, the redirect ended in a mysql error page. Checking the error, I realised that the sql prefix is duplicated. The following change fixed the issue for me.
read.php - error
Line 16 - $db->update (DATABASE_PREFIX.'dynamic_qrcodes', $data);
read.php - fix
Line 16 - $db->update ("dynamic_qrcodes", $data);