diff --git a/packages/logging-system/src/Logger.ts b/packages/logging-system/src/Logger.ts
index 2761bf0..23ffb14 100644
--- a/packages/logging-system/src/Logger.ts
+++ b/packages/logging-system/src/Logger.ts
@@ -1,8 +1,8 @@
 import { sha256, base64Encode, hexToUtf8 } from '@yourssu/crypto';
 
-import { SetLocalStorage, SetLocalStorageClear } from './SetLocalStorage';
+import { SetLocalStorage } from './SetLocalStorage';
 import { useYLSContext } from './hooks/useYLSContext';
-import { LogPayloadParams, LogRequestList, LogResponse, LogType } from './types/LogType';
+import { LogPayloadParams, LogRequestList, LogResponse } from './types/LogType';
 
 const createRandomId = () => {
   let randomId = '';
@@ -19,13 +19,13 @@ const createRandomId = () => {
 };
 
 const createHashedID = (userId: string) => {
-  let hashedId = '';
+  let hashedId: string;
   let localHashedId = '';
   const existLocalHashedId = window.localStorage.getItem('yls-web');
 
   if (userId === '') {
     if (existLocalHashedId) {
-      localHashedId = JSON.parse(window.localStorage.getItem('yls-web') as string).hashedId;
+      localHashedId = JSON.parse(existLocalHashedId).hashedId;
     } else {
       userId = createRandomId();
     }
@@ -87,22 +87,3 @@ export const Logger = ({ userId, version, event }: LogPayloadParams) => {
     },
   };
 };
-
-window.addEventListener('unload', async (event) => {
-  event.preventDefault();
-
-  const { postLog } = useYLSContext();
-  const logList: LogType[] = JSON.parse(localStorage.getItem('yls-web') as string) || [];
-  const req: LogRequestList = {
-    logRequestList: logList,
-  };
-
-  try {
-    const res = await postLog(req);
-    if (res.success) {
-      SetLocalStorageClear();
-    }
-  } catch (e) {
-    console.error('Failed to post log');
-  }
-});
diff --git a/packages/logging-system/src/SetLocalStorage.ts b/packages/logging-system/src/SetLocalStorage.ts
index b6c047c..05f0eb9 100644
--- a/packages/logging-system/src/SetLocalStorage.ts
+++ b/packages/logging-system/src/SetLocalStorage.ts
@@ -29,7 +29,7 @@ export const SetLocalStorage = async (
           SetLocalStorageClear();
         }
       } catch (e) {
-        console.error('Failed to post log');
+        console.error(e);
       }
     }
   }
diff --git a/packages/logging-system/src/contexts/YLSProvider.tsx b/packages/logging-system/src/contexts/YLSProvider.tsx
index bda7713..e12be51 100644
--- a/packages/logging-system/src/contexts/YLSProvider.tsx
+++ b/packages/logging-system/src/contexts/YLSProvider.tsx
@@ -1,7 +1,8 @@
-import { createContext } from 'react';
+import { createContext, useEffect } from 'react';
 
 import { createAxiosInstance } from '@/apis/createAxiosInstance';
-import { LogRequestList, LogResponse } from '@/types/LogType';
+import { LogRequestList, LogResponse, LogType } from '@/types/LogType';
+import { SetLocalStorageClear } from '@/SetLocalStorage';
 
 interface YLSProviderProps {
   children: React.ReactNode;
@@ -32,6 +33,32 @@ export const YLSProvider = ({ children, baseURL }: YLSProviderProps) => {
     }
   };
 
+  useEffect(() => {
+    const handleUnload = async (event: Event) => {
+      event.preventDefault();
+
+      const logList: LogType[] = JSON.parse(localStorage.getItem('yls-web') as string) || [];
+      const req: LogRequestList = {
+        logRequestList: logList,
+      };
+
+      try {
+        const res = await postLog(req);
+        if (res.success) {
+          SetLocalStorageClear();
+        }
+      } catch (e) {
+        console.error(e);
+      }
+    };
+
+    window.addEventListener('unload', handleUnload);
+
+    return () => {
+      window.removeEventListener('unload', handleUnload);
+    };
+  }, []);
+
   return (
     <YLSContext.Provider
       value={{