https://gesundheit-bh.de

You will need to contact the theme author regarding this error as we do not support theme users and have no way to debug the theme. We have no control over how theme authors use Redux. If the theme author discovers the issue is with Redux, they will need to contact us and we’ll work with them to resolve the issue.

Also, the reason everything works when you disable the plugin is because all the options within the theme are disabled. If this issue is within one of those features, it will appear fixed and thus the blame often falls on us when it’s really with the theme.

Good luck.

@briefsenden Providing the WP_DEBUG output for the error would certainly help identify things.

Also, are you sure it’s a 505 error and not the much more common 500 error? https://bobcares.com/blog/505-http-version-not-supported/ (among other articles/resources out there) explains why enabling/disabling a plugin really shouldn’t be encountering this issue as it’s more of a server misconfiguration where the server is unable to provide the HTTP protocol version the visitor is requesting (how would toggling this plugin be changing what HTTP version the server is able to use?) If it actually is a 505 error, then the issue likely goes beyond this one plugin causing it (hosting provider, CDN configuration [if any is being used], server configuration, etc.) Meanwhile, a 500 error could lead any number of common issues (compared to 505 specifically having a malformed HTTP version somehow or some other strange situation.)