Unfortunately, Opera Mini in not a supported browser.
On mobile devices, we recommend that Juicebox galleries are viewed in either Mobile Chrome or Mobile Safari.
Can you try to view your gallery in either Mobile Chrome or Mobile Safari on your mobile device to see what happens?

A Juicebox gallery should work fine in the desktop version of Opera, though.
If you are having trouble viewing a Juicebox gallery in Opera on a computer, then please let me know exactly what you mean when you say that "juicebox is crashing".
Also, please post the link to your gallery's web page so that I can see the problem for myself.
Once I'm able to see the gallery live on your web server, I should hopefully be able to determine the cause of the problem and propose a solution.
Thank you.