Use of undefined constant

Hi,

I have some message in the log I cannot explain:


2018-10-26T21:51:57+02:00 WARN: HORDE [imp] PHP ERROR: Use of  
undefined constant none - assumed 'none' (this will throw an Error in  
a future version of PHP) [pid 3751 on line 11 of  
"/var/www/html/post/imp/config/backends.local.php"]
2018-10-26T21:51:57+02:00 WARN: HORDE [imp] PHP ERROR: Use of  
undefined constant GB - assumed 'GB' (this will throw an Error in a  
future version of PHP) [pid 3751 on line 12 of  
"/var/www/html/post/imp/config/backends.local.php"]
2018-10-27T10:02:19+02:00 WARN: HORDE [imp] PHP ERROR: Use of  
undefined constant tls - assumed 'tls' (this will throw an Error in a  
future version of PHP) [pid 4544 on line 6 of  
"/var/www/html/post/imp/config/backends.local.php"]

WHat does it mean? E.g. I did not set a quota, which I dont want  
anyway, but it complains that this field is 'empty'?

Can you please advise?

Many thanks,
Andreas

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