diff --git a/dislocker_auth.py b/dislocker_auth.py
index c819015..3ae6611 100644
--- a/dislocker_auth.py
+++ b/dislocker_auth.py
@@ -307,7 +307,7 @@ class Auth():
             cursor.execute("SELECT pc_number FROM pc_list WHERE pc_number = %s", (pc_number,))
             pc_record_number_source = cursor.fetchall()
             
-            if pc_record_number_source == None:
+            if pc_record_number_source == []:
                 pc_token = self.token_generate(36)
                 master_password = self.master_password_generate(16)
                 master_password_hash = self.hash_genarate(master_password)