diff --git a/app/src/main/java/io/github/wulkanowy/data/sync/AccountSync.java b/app/src/main/java/io/github/wulkanowy/data/sync/AccountSync.java
index a79540a6..27b497c7 100644
--- a/app/src/main/java/io/github/wulkanowy/data/sync/AccountSync.java
+++ b/app/src/main/java/io/github/wulkanowy/data/sync/AccountSync.java
@@ -2,6 +2,8 @@ package io.github.wulkanowy.data.sync;
 
 import android.content.Context;
 
+import org.greenrobot.greendao.database.Database;
+
 import java.io.IOException;
 import java.util.List;
 
@@ -11,6 +13,7 @@ import javax.inject.Singleton;
 import io.github.wulkanowy.api.Vulcan;
 import io.github.wulkanowy.api.VulcanException;
 import io.github.wulkanowy.data.db.dao.entities.Account;
+import io.github.wulkanowy.data.db.dao.entities.DaoMaster;
 import io.github.wulkanowy.data.db.dao.entities.DaoSession;
 import io.github.wulkanowy.data.db.dao.entities.Diary;
 import io.github.wulkanowy.data.db.dao.entities.DiaryDao;
@@ -49,6 +52,8 @@ public class AccountSync {
     public void registerUser(String email, String password, String symbol)
             throws VulcanException, IOException, CryptoException {
 
+        clearUserData();
+
         vulcan.setCredentials(email, password, symbol, null, null, null);
 
         daoSession.getDatabase().beginTransaction();
@@ -152,4 +157,11 @@ public class AccountSync {
                 diary.getValue()
         );
     }
+
+    private void clearUserData() {
+        Database database = daoSession.getDatabase();
+        DaoMaster.dropAllTables(database, true);
+        DaoMaster.createAllTables(database, true);
+        sharedPref.setCurrentUserId(0);
+    }
 }