Keep loading when product update with more than 1 images in gallery and finally 500 error

[fordiy]

Describe the bug
Keep loading when product update with more than 1 images in gallery, and finally 500 error

To Reproduce
Steps to reproduce the behavior:

1. Go to product edit page and update it with more than 1 images in gallery
2. Click update, then keep loading, finally 500 error.

Expected behavior
Should be updated shortly.

Screenshots
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Enviroment (please complete the following information):

• Plugin Version 1.1.7
• WordPress Version [e.g. 5.7.2
• WooCommerce Version 5.3.0