php - Chat Application Database Query and Design -

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this database scheme query below.

this scenario confuses me. when login user_id = 1 , create conversation , receiver user_id = 4 query below works.. because query retrieve conversations based on sender. when log in user_id = 4 can't see conversation because i'm receiver , don't want create conversation i'm sender , receiver user_id = 1 because conversation started user_id = 1. can me query?

change inner join include receiver well, so

inner join conversations on (userprofiles.user_id = userprofiles.receiver_id or userprofiles.user_id = sender_id)

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