diff --git a/persistence-room/src/main/java/org/mercury_im/messenger/persistence/room/AppDatabase.java b/persistence-room/src/main/java/org/mercury_im/messenger/persistence/room/AppDatabase.java
index a27f18f..2361878 100644
--- a/persistence-room/src/main/java/org/mercury_im/messenger/persistence/room/AppDatabase.java
+++ b/persistence-room/src/main/java/org/mercury_im/messenger/persistence/room/AppDatabase.java
@@ -44,7 +44,7 @@ public abstract class AppDatabase extends RoomDatabase {
 
     public static final String TAG = "PERSISTENCE_ROOM";
 
-    public static AppDatabase getDatabase(final Context context) {
+    public static synchronized AppDatabase getDatabase(final Context context) {
         if (INSTANCE == null) {
             Logger.getLogger("DATABASE").log(Level.INFO, context.getApplicationContext().getDatabasePath(DB_NAME).getAbsolutePath());
             INSTANCE = Room.databaseBuilder(context.getApplicationContext(),