Shopify: Force 500 Internal Server Error on any shop (for one user)

There is very strange behavior. If user open urls like below: - https://whashp.myshopify.com/?previewthemeid=11288717 - or https://lmfshp.myshopify.com/?previewthemeid=11290937 He got redirect to shop https://whashp.myshopify.com/ and 500 Internal Server Error response, and reload does not help i...