diff --git a/dislocker.py b/dislocker.py
index b348162..7f5cf34 100644
--- a/dislocker.py
+++ b/dislocker.py
@@ -237,7 +237,8 @@ class Bot(discord.Client):
             return {"result": 1, "about": "error"}
 
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
 
     def keyboard_used_check(self, **kwargs):
         try:
@@ -263,7 +264,8 @@ class Bot(discord.Client):
             return {"result": 1, "about": "error"}
         
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
     
     def mouse_used_check(self, **kwargs):
         try:
@@ -289,11 +291,13 @@ class Bot(discord.Client):
             return {"result": 1, "about": "error"}
         
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
 
 
     def register(self, **kwargs):
         try:
+            cursor = None
             user_info = {
                 "id": str(kwargs["user_id"]),
                 "name": str(kwargs["name"]),
@@ -317,7 +321,6 @@ class Bot(discord.Client):
                 pass
             else:
                 user_info["mouse_number"] = int(kwargs["mouse_number"])
-            cursor = dislocker.db.cursor()
             # ユーザー登録されているかの確認
             user_register = self.user_register_check(discord_user_id=user_info["id"])
             if user_register["result"] == 0:
@@ -339,6 +342,7 @@ class Bot(discord.Client):
                                 password = self.password_generate(4)
                                 password_hash = self.hash_genarate(password)
                                 # PC使用履歴のテーブルにレコードを挿入
+                                cursor = dislocker.db.cursor()
                                 cursor.execute("INSERT INTO pc_usage_history (member_id, pc_number, keyboard_number, mouse_number, start_use_time, use_detail) VALUES (%s, %s, %s, %s, clock_timestamp(), %s)", (member_id, user_info["pc_number"], user_info["keyboard_number"], user_info["mouse_number"], user_info["detail"]))
                                 # PCリストの該当のレコードを更新
                                 cursor.execute("UPDATE pc_list SET using_member_id = %s, password_hash = %s WHERE pc_number = %s", (member_id, password_hash, user_info["pc_number"]))
@@ -371,7 +375,8 @@ class Bot(discord.Client):
             print(str(error))
             return {"result": 1, "about": "error"}
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
 
 
     def stop(self, **kwargs):
@@ -434,7 +439,8 @@ class Bot(discord.Client):
             return {"result": 1, "about": "error"}
 
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
 
     def user_register(self, **kwargs):
         try:
@@ -459,7 +465,8 @@ class Bot(discord.Client):
             return {"result": 1, "about": "error"}
 
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
 
 
     def format_datetime(self, value):
@@ -488,7 +495,8 @@ class Bot(discord.Client):
             return {"result": 1, "about": "error"}
 
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
 
     def report_export(self, **kwargs):
         try:
@@ -562,7 +570,8 @@ class Bot(discord.Client):
             return {"result": 1, "about": "error"}
 
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
 
 
     def force_stop(self, **kwargs):
@@ -612,7 +621,8 @@ class Bot(discord.Client):
             return {"result": 1, "about": "error"}
 
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
 
     async def timeout_notify(self, **kwargs):
         try:
@@ -1002,7 +1012,8 @@ class Monitor():
             dislocker.db.rollback()
 
         finally:
-            cursor.close()
+            if cursor:
+                cursor.close()
             print(result["result"])
             return result