vmCrypt::encrypt makes increased storage in database (#_session)

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Hello

On One Page Checkout, I choose Paypal Sandbox payment method.

https://gyazo.com/c760588e822321c6e541395eddced916

I refresh the page many times, I shall get the 500 error.

https://gyazo.com/5bdf5f0aa6e47fe25d2a05e174e1c2b0

I found the bug here

https://gyazo.com/75395fe28cec4ae2969593171207df17

Please, VM team can help me figure out a solution.

Thanks.

[GJC Web Design]

the actual error is???  Check your logs etc..