[MC-220715] error while joining modded LAN server

i try to join my friend modded lan game. i join and this crash error pops up and it brings me back to minecraft launcher page.

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Modded games and servers are not supported on this tracker.

Thank you for your report!
However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.

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Have you got the same mods? Because you need to have them to join another modded world.