Arena game interrupted in middle of battle

[2173.937] Setting 3rd side to monster 2, murderwing
[2173.937] Gui – EnterScreen [gui/screenfiles/monstercard/monstercard_ingame]
[2173.937] Gui – Screen Focus GAINED [gui/screenfiles/monstercard/monstercard_ingame]
[2175.266] WireSocketManager – Request ‘/user/keepalive’ with requirement Authenticated Enqueued RID 3486265D-7583-4ACE-8C1E-75501481B850
[2175.266] WireSocketManager – Request ‘/user/keepalive’ Started RID 3486265D-7583-4ACE-8C1E-75501481B850
[2175.359] WireSocketManager – Request ‘/user/keepalive’ Completed in 0.100s RID 3486265D-7583-4ACE-8C1E-75501481B850
[2177.812] Gui – ExitScreen [gui/screenfiles/monstercard/monstercard_ingame]
[2177.828] WireSocketManager – Request ‘arena_battle/execute_command’ with requirement GameSession Enqueued RID D578C40A-171B-4DA9-8CAF-32A0C6820A85
[2177.828] SpawnCommand::ApplySim – Spawning monsterId 2 with spawnId 0 at level 5 for team 1 at position (0, 0)
[2177.828] moving to (2, 2) after spawn
[2177.844] WireSocketManager – Request ‘arena_battle/execute_command’ Started RID D578C40A-171B-4DA9-8CAF-32A0C6820A85
[2177.859] Inventory – Flushed 39 entries
[2177.953] WireSocketManager – Request ‘arena_battle/execute_command’ Completed in 0.107s RID D578C40A-171B-4DA9-8CAF-32A0C6820A85
[2178.062] Gui – Screen Focus LOST [gui/screenfiles/monstercard/monstercard_ingame]
[2178.062] GuiManager::ProcessScreensMarkedForCleanup – mem used 433524736
[2178.672] Inventory – Flushed 28 entries
[2180.828] WireSocketManager – Request ‘arena_battle/execute_command’ with requirement GameSession Enqueued RID F007B458-9D17-4EA0-9C8F-2E4C1CE77E53
[2180.828] MoveCommand::ApplySim – Moving sim/objtemplates/monsters/murderwing/level01 to (4, 3)
[2180.844] WireSocketManager – Request ‘arena_battle/execute_command’ Started RID F007B458-9D17-4EA0-9C8F-2E4C1CE77E53
[2180.937] WireSocketManager – Request ‘arena_battle/execute_command’ Completed in 0.100s RID F007B458-9D17-4EA0-9C8F-2E4C1CE77E53
[2184.734] ArenaBattleHelper::Sim_StartEndLocalTurn
[2184.734] WireSocketManager – Request ‘arena_battle/execute_command’ with requirement GameSession Enqueued RID 4DF59CAB-63E8-4D96-9D26-81CE172C0418
[2184.750] WireSocketManager – Request ‘arena_battle/execute_command’ Started RID 4DF59CAB-63E8-4D96-9D26-81CE172C0418
[2184.859] WireSocketManager – Received server initiated message for ‘arena_battle/error’, messageID 5BDB69C8-39A2-4CB7-9979-7C66AFB0796E
[2184.859] BattlePlayState::OnArenaError – Error message: Server Error
[2184.891] Gui – EnterScreen [gui/screenfiles/common/cmn_generic_dialog]
[2184.891] Gui – Screen Focus LOST [gui/screenfiles/decorators/decorators_main]
[2184.891] Gui – Screen Focus LOST [gui/screenfiles/hud_battle/hudbattle_main]
[2184.891] Gui – Screen Focus LOST [gui/screenfiles/hud_battle/replay_main]
[2184.891] Gui – Screen Focus GAINED [gui/screenfiles/common/cmn_generic_dialog]
[2184.891] WireSocketManager – Request ‘arena_battle/execute_command’ Completed in 0.142s RID 4DF59CAB-63E8-4D96-9D26-81CE172C0418
[2186.250] Inventory – Flushed 2 entries
[2186.250] Gui – EnterScreen [gui/screenfiles/common/cmn_loading_screen]
[2186.250] Gui – Screen Focus LOST [gui/screenfiles/common/cmn_generic_dialog]
[2186.250] Gui – Screen Focus GAINED [gui/screenfiles/common/cmn_loading_screen]
[2186.250] ArenaBattleHelper::SyncPoint_OnFinalizeTurn
[2186.250] WireSocketManager – Request ‘arena_battle/finalize_turn’ with requirement GameSession Enqueued RID E2AC50F8-B027-408A-A972-228405DE5FB6
[2186.266] WireSocketManager – Request ‘arena_battle/finalize_turn’ Started RID E2AC50F8-B027-408A-A972-228405DE5FB6
[2186.359] WireSocket – Protocol error: Server Error
[2186.359] WireSocketManager – Server Error: Server Error
[2186.359] Gui – EnterScreen [gui/screenfiles/common/cmn_generic_dialog]
[2186.359] Gui – Screen Focus LOST [gui/screenfiles/common/cmn_loading_screen]
[2186.359] Gui – Screen Focus GAINED [gui/screenfiles/common/cmn_generic_dialog]

Thanks for the report.