Prevent potential arithmetic overflow

Description

There's a potential overflow in MultiUserChatServiceImpl as reported by LGTM

Details: https://lgtm.com/rules/7900075/

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Fix versions

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Created April 11, 2020 at 10:37 AM
Updated April 11, 2020 at 10:40 AM
Resolved April 11, 2020 at 10:40 AM