The mod Merging Chests (5.2.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event WideChests::on_configuration_changed
Invalid surface name: Surface names must not be blank and must be unique.
stack traceback:
[C]: in function 'create_surface'
...ts__/scripts/event_handlers/on_configuration_changed.lua:6: in function <...ts__/scripts/event_handlers/on_configuration_changed.lua:1>

These are my settings https://imgur.com/a/sjjcbUE

Couldn't reproduce, but most likely was fixed as part of SE compatibility fix in 5.2.1 version.