When playing with Friend I get this trying to log into the multiplayer side of things with him

48.167 Error ClientMultiplayerManager.cpp:1152: mod-coin_generation had the following event filters when the map was saved: on_entity_died (ID 4) (checksum: 1524088445)
48.167 Error ClientMultiplayerManager.cpp:1159: mod-coin_generation registered the following event filters when the map was loaded: on_entity_died (ID 4) (checksum: 2048504639)
48.167 Error ClientMultiplayerManager.cpp:101: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-coin_generation"

Hi,
Was this 18.0.2 of coin generation mod I assume?
What Factorio version are you on?
Also was it a locally hosted MP game or on a dedicated server?

I hit this the other day in testing, but when i made the dedicated server save and reload it went away and never came back. So hoped it was a fluke.

don't worry I have re-produced it. Its when the save was last made with 18.0.1 mod version and the players have 18.0.2.
If the save is updated to have 18.0.2 then the issue goes away.
so load the save on the server/player game with the new mod version, save the map and then reload the save and everyone can join fine <--- work around

ok thanks

and sorry for not responding irl stuff so forget to check some things

no problem, unusually for me I actually have time to look at it when its reported :)

lol yeah wasn't really expecting that quick of a check

18.0.3 is released and in testing fixes the issue and the undesirable behaviour that caused the mismatch (as seen in debugger).