diff --git a/src/core/game/GameImpl.ts b/src/core/game/GameImpl.ts
index b54618bca..f4ce9ea10 100644
--- a/src/core/game/GameImpl.ts
+++ b/src/core/game/GameImpl.ts
@@ -546,7 +546,7 @@ export class GameImpl implements Game {
         `${breaker} not allied with ${other}, cannot break alliance`,
       );
     }
-    if (!other.isTraitor()) {
+    if (!other.isTraitor() && !other.isDisconnected()) {
       breaker.markTraitor();
     }