don't disconnect on duplicate EXP requests

src/ReceiveSubcommands.cc

@@ -2001,8 +2001,11 @@ static void on_enemy_exp_request_bb(shared_ptr<Client> c, uint8_t, uint8_t, cons
 
   uint8_t state_flag = Map::Enemy::Flag::EXP_REQUESTED_BY_PLAYER0 << c->lobby_client_id;
   if (e.state_flags & state_flag) {
-    throw runtime_error("duplicate EXP request");
+    if (c->config.check_flag(Client::Flag::DEBUG_ENABLED)) {
+      send_text_message_printf(c, "$C5E-%hX __CHECKED__", cmd.enemy_index.load());
     }
+
+  } else {
     e.state_flags |= state_flag;
 
     double experience = 0.0;
@@ -2060,6 +2063,7 @@ static void on_enemy_exp_request_bb(shared_ptr<Client> c, uint8_t, uint8_t, cons
         item.data.set_sealed_item_kill_count(item.data.get_sealed_item_kill_count() + 1);
       }
     }
+  }
 }
 
 void on_meseta_reward_request_bb(shared_ptr<Client> c, uint8_t, uint8_t, const void* data, size_t size) {