You might be able to head off more inquiries by putting a note by the switch - "Toggling may cause a temporary Gateway Error."
It isn't just the switch that can cause this. Any change to the plugin can potentially produce this.
Now,, tell me what you have installed on your production server
Code
ii openmediavault 4.1.7 all openmediavault - The open network attached storage solution
ii openmediavault-backup 4.0.1 all backup plugin for OpenMediaVault.
ii openmediavault-flashmemory 4.1 all folder2ram plugin for OpenMediaVault
ii openmediavault-keyring 1.0 all GnuPG archive keys of the OpenMediaVault archive
ii openmediavault-locate 3.4 all locate plugin for OpenMediaVault.
ii openmediavault-omvextrasorg 4.1.7 all OMV-Extras.org Package Repositories for OpenMediaVault
ii openmediavault-resetperms 3.3 all Reset Permissions
ii openmediavault-rsnapshot 4.1.3 all OpenMediaVault rsnapshot backup plugin.
ii openmediavault-sftp 3.1.6 all sftp server
ii openmediavault-symlinks 3.1.4 all OpenMediaVault symlinks plugin