My server crashes every 6:00 about it generates the following error

Hello I am jérémy, me and a friends have a server currently we have around 60 player! with crash every day! I need to determine the ex ante worry with your help currently the crash is impossible to live cars it rollbacks with stuff loss, money! I need help as soon as possible! thank you you would find the error report in a HASTEBIN (a secure site or we can store text to have a more lightening post!) I'm sorry for the meaning of the sentence I am french thank you for taking the time to check all the worries I looked for trouble alone with a lot of trouble Some of my plugins ask me for a version 1.9.4 R2 while I do not find it! in error I think to know from where come the worries my developer of the plugins does not answer more for almost 1 years so I wonder if the version of spigot are not the worries! thank you !

the error: https://hastebin.com/exeviyusih.md

1.9.4 isn't supported anymore, please update to 1.12.2 and try to reproduce the issue with updated plugins there.