diff --git a/src/ctf_gameserver/checker/database.py b/src/ctf_gameserver/checker/database.py
index a493a0e..8cb7926 100644
--- a/src/ctf_gameserver/checker/database.py
+++ b/src/ctf_gameserver/checker/database.py
@@ -67,8 +67,8 @@ def get_check_duration(db_conn, service_id, std_dev_count, prohibit_changes=Fals
     """
 
     with transaction_cursor(db_conn, prohibit_changes) as cursor:
-        cursor.execute('SELECT avg(extract(epoch from (placement_end - placement_start))) + %s *'
-                       '       stddev_pop(extract(epoch from (placement_end - placement_start)))'
+        cursor.execute('SELECT (avg(extract(epoch from (placement_end - placement_start))) + %s *'
+                       '        stddev_pop(extract(epoch from (placement_end - placement_start))))::float'
                        '    FROM scoring_flag, scoring_gamecontrol'
                        '    WHERE service_id = %s AND tick < current_tick', (std_dev_count, service_id))
         result = cursor.fetchone()
diff --git a/src/ctf_gameserver/checkerlib/lib.py b/src/ctf_gameserver/checkerlib/lib.py
index 934143b..b66b7f8 100644
--- a/src/ctf_gameserver/checkerlib/lib.py
+++ b/src/ctf_gameserver/checkerlib/lib.py
@@ -120,6 +120,9 @@ def get_flag(tick: int) -> str:
     current run. The returned flag can be used for both placement and checks.
     """
 
+    if not isinstance(tick, int):
+        raise TypeError('tick must be of type int')
+
     # Return dummy flag when launched locally
     if _launched_without_runner():
         try:
@@ -140,6 +143,9 @@ def set_flagid(data: str) -> None:
     Stores the Flag ID for the current team and tick.
     """
 
+    if not isinstance(data, str):
+        raise TypeError('data must be of type str')
+
     if not _launched_without_runner():
         _send_ctrl_message({'action': 'FLAGID', 'param': data})
         # Wait for acknowledgement
@@ -154,6 +160,9 @@ def store_state(key: str, data: Any) -> None:
     service and team with the given key as an additional identifier.
     """
 
+    if not isinstance(key, str):
+        raise TypeError('key must be of type str')
+
     serialized_data = base64.b64encode(pickle.dumps(data)).decode('ascii')
 
     if not _launched_without_runner():
@@ -178,6 +187,9 @@ def load_state(key: str) -> Any:
     current service and team), None is returned.
     """
 
+    if not isinstance(key, str):
+        raise TypeError('key must be of type str')
+
     if not _launched_without_runner():
         _send_ctrl_message({'action': 'LOAD', 'param': key})
         result = _recv_ctrl_message()
diff --git a/src/ctf_gameserver/controller/database.py b/src/ctf_gameserver/controller/database.py
index 239ce06..f501749 100644
--- a/src/ctf_gameserver/controller/database.py
+++ b/src/ctf_gameserver/controller/database.py
@@ -27,7 +27,8 @@ def get_control_info(db_conn, prohibit_changes=False):
 def increase_tick(db_conn, prohibit_changes=False):
 
     with transaction_cursor(db_conn, prohibit_changes) as cursor:
-        cursor.execute('UPDATE scoring_gamecontrol SET current_tick = current_tick + 1, cancel_checks = 0')
+        cursor.execute('UPDATE scoring_gamecontrol SET current_tick = current_tick + 1,'
+                       '                               cancel_checks = false')
         # Create flags for every service and team in the new tick
         cursor.execute('INSERT INTO scoring_flag (service_id, protecting_team_id, tick)'
                        '    SELECT service.id, team.user_id, control.current_tick'
@@ -39,7 +40,7 @@ def increase_tick(db_conn, prohibit_changes=False):
 def cancel_checks(db_conn, prohibit_changes=False):
 
     with transaction_cursor(db_conn, prohibit_changes) as cursor:
-        cursor.execute('UPDATE scoring_gamecontrol SET cancel_checks = 1')
+        cursor.execute('UPDATE scoring_gamecontrol SET cancel_checks = true')
 
 
 def update_scoring(db_conn):
diff --git a/src/ctf_gameserver/web/templates/base-common.html b/src/ctf_gameserver/web/templates/base-common.html
index bd8975d..501e188 100644
--- a/src/ctf_gameserver/web/templates/base-common.html
+++ b/src/ctf_gameserver/web/templates/base-common.html
@@ -22,7 +22,7 @@
         <title itemprop="name">{% block title %}{% endblock %} | {{ competition_name }}</title>
 
         <meta name="description" itemprop="description" property="og:description" content="
-            FAUST CTF 2022 is an online attack-defense CTF competition run by FAUST, the CTF team of
+            FAUST CTF 2023 is an online attack-defense CTF competition run by FAUST, the CTF team of
             Friedrich-Alexander University Erlangen-Nürnberg
         " />
         <meta name="keywords" content="
diff --git a/tests/checker/test_integration.py b/tests/checker/test_integration.py
index 36757ff..1493af6 100644
--- a/tests/checker/test_integration.py
+++ b/tests/checker/test_integration.py
@@ -274,7 +274,7 @@ def test_cancel_checks(self, monotonic_mock, warning_mock):
         os.kill(checkerscript_pid, 0)
 
         with transaction_cursor(self.connection) as cursor:
-            cursor.execute('UPDATE scoring_gamecontrol SET cancel_checks=1')
+            cursor.execute('UPDATE scoring_gamecontrol SET cancel_checks=true')
 
         master_loop.supervisor.queue_timeout = 0.01
         monotonic_mock.return_value = 190
diff --git a/tests/controller/test_main_loop.py b/tests/controller/test_main_loop.py
index 273ff72..9657cf3 100644
--- a/tests/controller/test_main_loop.py
+++ b/tests/controller/test_main_loop.py
@@ -108,7 +108,7 @@ def test_next_tick_overdue(self, sleep_mock, _):
         with transaction_cursor(self.connection) as cursor:
             cursor.execute('UPDATE scoring_gamecontrol SET start=datetime("now", "-19 minutes"), '
                            '                               end=datetime("now", "+1421 minutes"), '
-                           '                               current_tick=5, cancel_checks=1')
+                           '                               current_tick=5, cancel_checks=true')
 
         controller.main_loop_step(self.connection, self.metrics, False)