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Why repeat this error "mybb_sessions' is marked as crashed" ؟

and Show that message

MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
    145 - Table './*********/mybb_sessions' is marked as crashed and should be repaired
Query:
    SELECT * FROM mybb_sessions WHERE sid='5f75da379e5f9a263e9538148ae35e37' AND ip='************' LIMIT 1 

Go to PHPMyAdmin > Your MyBB Database > mybb_sessions

Tick the checkbox to the left of the table name.
Scroll down to the dropdown menu. Click on it, the menu should pop up.
You see a "Repair Table" function, click it.

It should be solved.

thank you
but I want to know the cause of the problem recurs

If you are on localhost, this problem occurs frequently due to not shutting down the server properly. Or if you are on other online servers, those servers must have interrupted power supplies.

You can use this to permantly fix this so it won't happen again.
Run this query in phpMyAdmin.

ALTER TABLE `mybb_sessions` engine = `memory`