diff --git a/hwe/func_gamerule.php b/hwe/func_gamerule.php
index c1303323..3eb7f996 100644
--- a/hwe/func_gamerule.php
+++ b/hwe/func_gamerule.php
@@ -909,24 +909,33 @@ function checkEmperior()
     //연감 월결산
     LogHistory();
 
-    $invaderMsgCnt = 2;
-    foreach(range(12, 5, -1) as $chiefLevel){
-        if(!key_exists($chiefLevel, $chiefs)){
-            continue;
-        }
-        $targetChief = $chiefs[$chiefLevel];
-        if($targetChief['npc'] >= 2){
-            continue;
-        }
-        $invaderMsgs = RaiseInvaderMessage::buildRaiseInvaderMessage($targetChief['no']);
-        foreach($invaderMsgs as $invaderMsg){
-            $invaderMsg->send();
-        }
-        $invaderMsgCnt--;
-        if($invaderMsgCnt <= 0){
+    $availableInvaderGame = false;
+    foreach(CityConst::all() as $city){
+        if($city->level == 4){
+            $availableInvaderGame = true;
             break;
         }
     }
+    if($availableInvaderGame){
+        $invaderMsgCnt = 2;
+        foreach(range(12, 5, -1) as $chiefLevel){
+            if(!key_exists($chiefLevel, $chiefs)){
+                continue;
+            }
+            $targetChief = $chiefs[$chiefLevel];
+            if($targetChief['npc'] >= 2){
+                continue;
+            }
+            $invaderMsgs = RaiseInvaderMessage::buildRaiseInvaderMessage($targetChief['no']);
+            foreach($invaderMsgs as $invaderMsg){
+                $invaderMsg->send();
+            }
+            $invaderMsgCnt--;
+            if($invaderMsgCnt <= 0){
+                break;
+            }
+        }
+    }
 }
 
 function updateMaxDomesticCritical(General $general, $score)
diff --git a/hwe/sammo/Event/Action/RaiseInvader.php b/hwe/sammo/Event/Action/RaiseInvader.php
index 3e151dd0..c58c069b 100644
--- a/hwe/sammo/Event/Action/RaiseInvader.php
+++ b/hwe/sammo/Event/Action/RaiseInvader.php
@@ -93,8 +93,6 @@ class RaiseInvader extends \sammo\Event\Action
     public function run(array $env)
     {
         $db = DB::db();
-        $gameStor = KVStorage::getStorage($db, 'game_env');
-        $gameStor->setValue('isunited', 1);
 
         $npcEachCount = $this->npcEachCount;
 
@@ -107,6 +105,13 @@ class RaiseInvader extends \sammo\Event\Action
             $cities[] = $cityObj;
         }
 
+        if(!$cities){
+            return [__CLASS__, 0];
+        }
+
+        $gameStor = KVStorage::getStorage($db, 'game_env');
+        $gameStor->setValue('isunited', 1);
+
         if ($npcEachCount < 0) {
             $npcEachCount =
                 $db->queryFirstField('SELECT count(no) from general where npc < 4') / count($cities);