HTTP error on image upload


A client brought up that they were getting an "HTTP Error" when uploading images. This appears to have been a common problem throughout the history of WordPress with many various fixes. This is happening with at least 2 of my client sites.

What works to resolve this error is to deactivate the WP Smush Pro plugin. Once deactivated, we can upload images without any issues. This seems to have happened most recently since the latest version of WP came out. My client sites also use HTTPS.

Any chance you can help me solve this problem so that I can continue to use WP Smush Pro and not get the HTTPS Error?

Thanks in advanced!