diff --git a/hwe/sammo/DummyGeneral.php b/hwe/sammo/DummyGeneral.php
index 9e6acb2d..4996ebe4 100644
--- a/hwe/sammo/DummyGeneral.php
+++ b/hwe/sammo/DummyGeneral.php
@@ -37,7 +37,7 @@ class DummyGeneral extends General
         }
     }
 
-    public function setCrewType(GameUnitDetail $crewType){
+    public function setCrewType(?GameUnitDetail $crewType){
         $this->crewType = $crewType;
     }
 
diff --git a/hwe/sammo/WarUnitCity.php b/hwe/sammo/WarUnitCity.php
index df4a7fa2..ff688e84 100644
--- a/hwe/sammo/WarUnitCity.php
+++ b/hwe/sammo/WarUnitCity.php
@@ -84,6 +84,9 @@ class WarUnitCity extends WarUnit{
         $this->currPhase = 0;
         $this->prePhase = 0;
         $this->bonusPhase = 0;
+        /** @var DummyGeneral $general */
+        $general = $this->general;
+        $general->setCrewType(null);
     }
 
     function isSiege(): bool{