Looks like the problem was introduced here 
<https://github.com/web2py/web2py/commit/69549888512a1c63ac577cbd5f76ec5b44e5f891>
 
(and updated here 
<https://github.com/web2py/web2py/commit/4bfa9c1686a83983239bbf8ecdd13c5b50f877ea>).
 
Feel free to open an issue on Github.

Anthony

On Wednesday, March 14, 2018 at 6:32:46 PM UTC-4, Paolo Caruccio wrote:
>
> The relevant code that generates the issue is:
>
>
>
>     rischi_della_mansione = "GROUP_CONCAT(rischio, ', ')"
>
>
>     l = [db.RISCHI_MANSIONE.on(
>             (db.RISCHI_MANSIONE.mansione_ID==db.MANSIONE.id)),
>          db.RISCHI.on(
>             (db.RISCHI.id==db.RISCHI_MANSIONE.rischio_ID))
>         ]
>
>
>     mansioni = db((db.MANSIONE.id>0)).select(db.MANSIONE.mansione,
>                                              rischi_della_mansione,
>                                              left=l,
>                                              groupby=db.MANSIONE.id
>                                             )
>
>
>     fattori_rischio = SQLTABLE(mansioni,
>                                truncate=None,
>                                _id="rischi",
>                                headers={'MANSIONE.mansione':'MANSIONE',
>                                         rischi_della_mansione:'FATTORI DI 
> RISCHIO'
>                                         },
>                                         columns=['MANSIONE.mansione',
>                                                  rischi_della_mansione
>                                         ]
>                                 )
>
> The traceback screenshot is:
>
>
> <https://lh3.googleusercontent.com/-WMtRONVueqU/WqmeVm7gToI/AAAAAAAABBs/sAGtbWmUkYw5q71s8Q8rjZJH5VE9EY7EQCLcBGAs/s1600/Screenshot.png>
>
>
>
> Please note that the code is working well on web2py Version 
> 2.14.6-stable+timestamp.2016.05.10.00.21.47
>
> Has anybody found the same issue and solved it?
>
> Thank you.
>
>
>
>
>
>

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