tnx. in effect this is exactly what i see, but also after kill and restart it didn’t work.
but at least this time I had time to read the logs 
it seems that fail to reload whitelist/blacklist/custom, some fatal errors:
2019-06-11 15:09:38 [26830] loading URL table from "/var/squidGuard/blacklists/recreation/restaurants/domains"
2019-06-11 15:09:38 [26830]
2019-06-11 15:09:38 [26830] FATAL ERROR: cannot read from "/var/squidGuard/blacklists/custom/whitelist/domains.ufdb" (read-only): No such file or directory *****
2019-06-11 15:09:38 [26830]
2019-06-11 15:09:38 [26830] loading URL table from "/var/squidGuard/blacklists/custom/whitelist/domains"
2019-06-11 15:09:38 [26830] ERROR: URL database table "/var/squidGuard/blacklists/custom/whitelist/domains" is empty and is ignored *****
2019-06-11 15:09:38 [26830] loading URL category defaulttable with creation date 20190611.0244
2019-06-11 15:09:38 [26830] loading URL table from "/var/squidGuard/blacklists/finance/banking/domains"
…
2019-06-11 16:32:29 [4165] database status: up to date
2019-06-11 16:32:29 [4165] license status: unknown
2019-06-11 16:32:29 [4165] configuration status: fatal error(s)
2019-06-11 16:32:29 [4165]
2019-06-11 16:32:29 [4165] Changing daemon status to "error"
2019-06-11 16:32:29 [4165] time definitions are used; evaluating current ACLs
2019-06-11 16:32:29 [4165] A FATAL ERROR OCCURRED: all requests are answered with "OK" (see previous lines with "FATAL ERROR" for more details) *****
2019-06-11 16:32:29 [4165] releasing the rwlock
i’ll try to replicate on a clean vm