diff --git a/src/adischeck_online.py b/src/adischeck_online.py
index c175359..35c94c9 100644
--- a/src/adischeck_online.py
+++ b/src/adischeck_online.py
@@ -1,12 +1,11 @@
 
 
 
-import re
-from playwright.sync_api import Playwright, sync_playwright, expect
+from playwright.sync_api import Playwright, sync_playwright
+from playwright.sync_api import Page
 from src.database import Database
 import pyperclip as clipboard
 
-import time
 def run():
     browser = sync_playwright().start().chromium.launch(headless=False)
     context = browser.new_context()
@@ -20,7 +19,7 @@ def run():
     page.get_by_role("textbox", name="Mediennummer").click()
     return page
 
-def work_on_page(page, mednr: str):
+def work_on_page(page: Page, mednr: str):
     db = Database()
     page.get_by_role("textbox", name="Mediennummer").fill(mednr)
     page.get_by_text("Suche starten").nth(1).click()
@@ -34,6 +33,9 @@ def work_on_page(page, mednr: str):
     print(signature)
 
     new_signature = db.insert(signature)
+    if new_signature is None:
+        print("Signature already exists in the database.")
+        return
     clipboard.copy(new_signature)
 
     page.locator("input[name=\"cellEditValue\\$7\"]").fill(new_signature)