Index: binaries/data/mods/public/gui/lobby/lobby.js
===================================================================
--- binaries/data/mods/public/gui/lobby/lobby.js
+++ binaries/data/mods/public/gui/lobby/lobby.js
@@ -1017,7 +1017,7 @@
 				Math.round(playerRatings.reduce((sum, current) => sum + current) / playerRatings.length) :
 				g_DefaultLobbyRating;
 
-		if (!hasSameMods(JSON.parse(game.mods), Engine.GetEngineInfo().mods))
+		if (!game.mods || !hasSameMods(JSON.parse(game.mods), Engine.GetEngineInfo().mods))
 			game.state = "incompatible";
 
 		return game;