diff --git a/src/rooms/commands/SelectPetCommand.ts b/src/rooms/commands/SelectPetCommand.ts
index 3b68fd3..c59e84f 100644
--- a/src/rooms/commands/SelectPetCommand.ts
+++ b/src/rooms/commands/SelectPetCommand.ts
@@ -81,7 +81,7 @@ export class SelectPetCommand extends Command<CardGameState, {client: Client,
 
         let dstplayer = this.state.players.get(playerId);
         let dstpet;
-        if (pos != undefined) {
+        if (dstplayer && pos != undefined) {
             dstpet = dstplayer.pets.get(pos+'');
         }
         let cardpoint = moreAp + ap;