Json-CRITICAL **: json_array_get_length: assertion 'array != NULL'

[EionRobb]

Original report by Evgeny Hanikblum (Bitbucket: honeyflower, GitHub: honeyflower).

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when using group chats, sometimes all works great, but sometimes it start flooding logs & console with the following error :

#!c

Json-CRITICAL **: json_array_get_length: assertion 'array != NULL'