diff --git a/bibcheck.py b/bibcheck.py
index 921fa9d..4b43c0f 100644
--- a/bibcheck.py
+++ b/bibcheck.py
@@ -8,69 +8,126 @@ import mechanize
 import pushover
 import datetime
 import os
+import logging
+
+logging.basicConfig(level=getattr(logging, os.environ.get("LOG_LEVEL", "INFO")))
+_logger = logging.getLogger(__name__)
+
 
 def split_notify(string):
-    values = string.split(':')
+    values = string.split(":")
     return (values[0], values[1:])
 
 
 def main():
+    try:
+        pushover.init(os.environ["PUSHOVER_KEY"])
+    except:
+        _logger.exception("Pushover KEY is required")
+        return
     while True:
-        pushover.init(os.environ['PUSHOVER_KEY'])
-        if 'HEALTHCHECK_URL' in os.environ:
-            requests.get(f"{os.environ['HEALTHCHECK_URL']}/start")
-        allinfo = []
-        users = list(map(lambda x: x.split(':', 1), os.environ['BIB_USERS'].split(',')))
-        notify = dict(map(split_notify, os.environ['NOTIFY_USERS'].split(',')))
-        for user, pwd in users:
-            allinfo += check(user, pwd, notify.get(user, []))
-        if 'HEALTHCHECK_URL' in os.environ:
-            requests.post(f"{os.environ['HEALTHCHECK_URL']}", data='\n'.join(allinfo).encode('utf8'))
-        if 'RUN_FOREVER' in os.environ and os.environ['RUN_FOREVER'] == 'False':
-            break
+        try:
+            _logger.info("Starting Bibcheck")
+            if "HEALTHCHECK_URL" in os.environ:
+                _logger.info("Pinging Healthcheck [start]")
+                _logger.debug(
+                    f"Pinging Healthcheck Url {os.environ['HEALTHCHECK_URL']}/start"
+                )
+                requests.get(f"{os.environ['HEALTHCHECK_URL']}/start")
+            allinfo = []
+            users = list(
+                map(lambda x: x.split(":", 1), os.environ["BIB_USERS"].split(","))
+            )
+            notify = dict(map(split_notify, os.environ["NOTIFY_USERS"].split(",")))
+            _logger.info(f"Found {len(users)} user(s) to check for")
+            for user, pwd in users:
+                _logger.info(f"Check for {user}")
+                allinfo += check(user, pwd, notify.get(user, []))
+            if "HEALTHCHECK_URL" in os.environ:
+                _logger.info("Pinging Healthcheck [stop]")
+                requests.post(
+                    f"{os.environ['HEALTHCHECK_URL']}",
+                    data="\n".join(allinfo).encode("utf8"),
+                )
+            if "RUN_FOREVER" in os.environ and os.environ["RUN_FOREVER"] == "False":
+                _logger.info("Finished")
+                break
+        except Exception as e:
+            _logger.exception("Check Failed ")
+            if "HEALTHCHECK_URL" in os.environ:
+                _logger.info("Pinging Healthcheck [failed]")
+                _logger.debug(
+                    f"Pinging Healthcheck Url {os.environ['HEALTHCHECK_URL']}/fail"
+                )
+                requests.post(
+                    f"{os.environ['HEALTHCHECK_URL']}/fail",
+                    data="\n".join(allinfo).encode("utf8"),
+                )
 
         now = datetime.datetime.utcnow
-        to = (now() + datetime.timedelta(days = 1)).replace(hour=os.environ.get('RUN_AT_HOUR', 6), minute=os.environ.get('RUN_AT_MINUTE', 0), second=0)
-        time.sleep((to-now()).seconds)
+        to = (now() + datetime.timedelta(days=1)).replace(
+            hour=os.environ.get("RUN_AT_HOUR", 6),
+            minute=os.environ.get("RUN_AT_MINUTE", 0),
+            second=0,
+        )
+        _logger.info(f"Sleeping till {to.isodate()}")
+        time.sleep((to - now()).seconds)
+
 
 def check(username, password, notify_ids):
     br = mechanize.Browser()
-    starturl = os.environ.get('LIBRARY_URL', 'https://ssl.muenchen.de/aDISWeb/app?service=direct/0/Home/$DirectLink&sp=SOPAC')
+    starturl = os.environ.get(
+        "LIBRARY_URL",
+        "https://ssl.muenchen.de/aDISWeb/app?service=direct/0/Home/$DirectLink&sp=SOPAC",
+    )
+    _logger.info(f"Library URL used: {starturl}")
     response = br.open(starturl)
+    _logger.info(f"Goto loginpage")
     br.follow_link(text_regex=r"Anmeld(en|ung abschicken)")
-    br.select_form('Form0')
-    br['$Textfield'] = username
-    br['$Textfield$0'] = password
+    _logger.info(f"Fill form")
+    br.select_form("Form0")
+    br["$Textfield"] = username
+    br["$Textfield$0"] = password
+    _logger.info(f"Sumbit form")
     response = br.submit()
+    _logger.info(f"Open account page")
     br.follow_link(text_regex=r"Konto")
     try:
+        _logger.info(f"Open lent list")
         response = br.follow_link(text_regex=r"Ausleihen? zeigen")
-        br.select_form('Form0')
-        response = br.submit(name='textButton$0', label='Alle verlängern')
-        lentlist = bs4.BeautifulSoup(response.read(), 'html.parser')
+        br.select_form("Form0")
+        response = br.submit(name="textButton$0", label="Alle verlängern")
+        lentlist = bs4.BeautifulSoup(response.read(), "html.parser")
         table = lentlist.select('table[class="rTable_table"]')[0]
         allinfo = []
-        for entry in table.tbody.select('tr'):
-            info = list(map(lambda x: str(x.text).strip(), entry.select('td')))
-            date = datetime.datetime.strptime(info[1], '%d.%m.%Y')
+        _logger.info(f"Parsing table")
+        for entry in table.tbody.select("tr"):
+            info = list(map(lambda x: str(x.text).strip(), entry.select("td")))
+            date = datetime.datetime.strptime(info[1], "%d.%m.%Y")
             delta = date - datetime.datetime.now()
             allinfo.append(str(info))
             if delta.days <= 10 or delta.days == 20 or delta.days == 15:
-                message = f'Bitte an {info[3]} denken\n' 
+                message = f"Bitte an {info[3]} denken\n"
                 if delta.days <= 7:
                     message += '<font color="#ff0000">'
-                message += f'Abgabe <b>{info[1]}</b>'
+                message += f"Abgabe <b>{info[1]}</b>"
                 if delta.days <= 7:
-                    message += '</font>'
-                message += f' - {username}'
-                for client in itertools.chain(notify_ids, os.environ.get('PUSHOVER_CLIENTS', '').split(',')):
+                    message += "</font>"
+                message += f" - {username}"
+                for client in itertools.chain(
+                    notify_ids, os.environ.get("PUSHOVER_CLIENTS", "").split(",")
+                ):
                     try:
-                        pushover.Client(client).send_message(message, title="Erinnerung", html=1)
+                        pushover.Client(client).send_message(
+                            message, title="Erinnerung", html=1
+                        )
                     except:
                         print("No client")
     except (StopIteration, mechanize._mechanize.LinkNotFoundError) as e:
+        _logger.exception("Failed to read information")
         return []
     return allinfo
 
+
 if __name__ == "__main__":
     main()