diff --git a/tests/test_api_key.py b/tests/test_api_key.py
index 48ea269..7d26361 100644
--- a/tests/test_api_key.py
+++ b/tests/test_api_key.py
@@ -50,6 +50,10 @@ class TestApiKey(UptimeKumaTestCase):
         with self.assertRaises(UptimeKumaException):
             self.api.get_api_key(api_key_id)
 
+    def test_delete_not_existing_api_key(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_api_key(42)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/test_docker_host.py b/tests/test_docker_host.py
index 2b264ab..b9dc8b7 100644
--- a/tests/test_docker_host.py
+++ b/tests/test_docker_host.py
@@ -47,6 +47,10 @@ class TestDockerHost(UptimeKumaTestCase):
         with self.assertRaises(UptimeKumaException):
             self.api.get_docker_host(docker_host_id)
 
+    def test_delete_not_existing_docker_host(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_docker_host(42)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/test_maintenance.py b/tests/test_maintenance.py
index 122026e..a33d67a 100644
--- a/tests/test_maintenance.py
+++ b/tests/test_maintenance.py
@@ -260,6 +260,10 @@ class TestMaintenance(UptimeKumaTestCase):
         with self.assertRaises(UptimeKumaException):
             self.api.get_maintenance(maintenance_id)
 
+    def test_delete_not_existing_maintenance(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_maintenance(42)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/test_monitor.py b/tests/test_monitor.py
index 516256f..1b3e9b7 100644
--- a/tests/test_monitor.py
+++ b/tests/test_monitor.py
@@ -298,6 +298,10 @@ class TestMonitor(UptimeKumaTestCase):
         }
         self.do_test_monitor_type(expected_monitor)
 
+    def test_delete_not_existing_monitor(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_monitor(42)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/test_monitor_tag.py b/tests/test_monitor_tag.py
index 9585893..90c4955 100644
--- a/tests/test_monitor_tag.py
+++ b/tests/test_monitor_tag.py
@@ -1,5 +1,6 @@
 import unittest
 
+from uptime_kuma_api import UptimeKumaException
 from uptime_kuma_test_case import UptimeKumaTestCase
 
 
@@ -32,6 +33,10 @@ class TestMonitorTag(UptimeKumaTestCase):
         monitor = self.find_by_id(monitors, monitor_id)
         self.assertEqual(monitor["tags"], [])
 
+    def test_delete_not_existing_monitor_tag(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_monitor_tag(42, 42, 42)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/test_notification.py b/tests/test_notification.py
index 1c20915..ed8b364 100644
--- a/tests/test_notification.py
+++ b/tests/test_notification.py
@@ -55,6 +55,10 @@ class TestNotification(UptimeKumaTestCase):
         with self.assertRaises(UptimeKumaException):
             self.api.delete_notification(notification_id)
 
+    def test_delete_not_existing_notification(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_notification(42)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/test_proxy.py b/tests/test_proxy.py
index 1e3a587..5ddeebb 100644
--- a/tests/test_proxy.py
+++ b/tests/test_proxy.py
@@ -50,6 +50,10 @@ class TestProxy(UptimeKumaTestCase):
         with self.assertRaises(UptimeKumaException):
             self.api.get_proxy(proxy_id)
 
+    def test_delete_not_existing_proxy(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_proxy(42)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/test_status_page.py b/tests/test_status_page.py
index 1464942..41e0e00 100644
--- a/tests/test_status_page.py
+++ b/tests/test_status_page.py
@@ -89,6 +89,10 @@ class TestStatusPage(UptimeKumaTestCase):
         status_page = self.find_by_id(status_pages, slug, "slug")
         self.assertIsNone(status_page)
 
+    def test_delete_not_existing_status_page(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_status_page("slug42")
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/test_tag.py b/tests/test_tag.py
index 5b6b8bf..d40521c 100644
--- a/tests/test_tag.py
+++ b/tests/test_tag.py
@@ -40,6 +40,10 @@ class TestTag(UptimeKumaTestCase):
         with self.assertRaises(UptimeKumaException):
             self.api.get_tag(tag_id)
 
+    def test_delete_not_existing_tag(self):
+        with self.assertRaises(UptimeKumaException):
+            self.api.delete_tag(42)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/uptime_kuma_api/api.py b/uptime_kuma_api/api.py
index af01bfa..a8c11ce 100644
--- a/uptime_kuma_api/api.py
+++ b/uptime_kuma_api/api.py
@@ -1111,6 +1111,8 @@ class UptimeKumaApi(object):
             }
         """
         with self.wait_for_event(Event.MONITOR_LIST):
+            if id_ not in [i["id"] for i in self.get_monitors()]:
+                raise UptimeKumaException("monitor does not exist")
             return self._call('deleteMonitor', id_)
 
     def get_monitor_beats(self, id_: int, hours: int) -> list[dict]:
@@ -1304,10 +1306,22 @@ class UptimeKumaApi(object):
                 'msg': 'Deleted Successfully.'
             }
         """
-        r = self._call('deleteMonitorTag', (tag_id, monitor_id, value))
-        # the monitor list event does not send the updated tags
-        self._event_data[Event.MONITOR_LIST][str(monitor_id)] = self.get_monitor(monitor_id)
-        return r
+        with self.wait_for_event(Event.MONITOR_LIST):
+            tags = [
+                {
+                    "monitor_id": y["monitor_id"],
+                    "tag_id": y["tag_id"],
+                    "value": y["value"]
+                } for x in [
+                    i.get("tags") for i in self.get_monitors()
+                ] for y in x
+            ]
+            if {"monitor_id": monitor_id, "tag_id": tag_id, "value": value} not in tags:
+                raise UptimeKumaException("monitor tag does not exist")
+            r = self._call('deleteMonitorTag', (tag_id, monitor_id, value))
+            # the monitor list event does not send the updated tags
+            self._event_data[Event.MONITOR_LIST][str(monitor_id)] = self.get_monitor(monitor_id)
+            return r
 
     # notification
 
@@ -1487,6 +1501,8 @@ class UptimeKumaApi(object):
             }
         """
         with self.wait_for_event(Event.NOTIFICATION_LIST):
+            if id_ not in [i["id"] for i in self.get_notifications()]:
+                raise UptimeKumaException("notification does not exist")
             return self._call('deleteNotification', id_)
 
     def check_apprise(self) -> bool:
@@ -1646,6 +1662,8 @@ class UptimeKumaApi(object):
             }
         """
         with self.wait_for_event(Event.PROXY_LIST):
+            if id_ not in [i["id"] for i in self.get_proxies()]:
+                raise UptimeKumaException("proxy does not exist")
             return self._call('deleteProxy', id_)
 
     # status page
@@ -1783,16 +1801,19 @@ class UptimeKumaApi(object):
             >>> api.delete_status_page("slug1")
             {}
         """
-        r = self._call('deleteStatusPage', slug)
+        with self.wait_for_event(Event.STATUS_PAGE_LIST):
+            if slug not in [i["slug"] for i in self.get_status_pages()]:
+                raise UptimeKumaException("status page does not exist")
+            r = self._call('deleteStatusPage', slug)
 
-        # uptime kuma does not send the status page list event when a status page is deleted
-        for status_page in self._event_data[Event.STATUS_PAGE_LIST].values():
-            if status_page["slug"] == slug:
-                status_page_id = status_page["id"]
-                del self._event_data[Event.STATUS_PAGE_LIST][str(status_page_id)]
-                break
+            # uptime kuma does not send the status page list event when a status page is deleted
+            for status_page in self._event_data[Event.STATUS_PAGE_LIST].values():
+                if status_page["slug"] == slug:
+                    status_page_id = status_page["id"]
+                    del self._event_data[Event.STATUS_PAGE_LIST][str(status_page_id)]
+                    break
 
-        return r
+            return r
 
     def save_status_page(self, slug: str, **kwargs) -> dict:
         """
@@ -2424,6 +2445,8 @@ class UptimeKumaApi(object):
                 'msg': 'Deleted Successfully.'
             }
         """
+        if id_ not in [i["id"] for i in self.get_tags()]:
+            raise UptimeKumaException("tag does not exist")
         return self._call('deleteTag', id_)
 
     # settings
@@ -3000,6 +3023,8 @@ class UptimeKumaApi(object):
             }
         """
         with self.wait_for_event(Event.DOCKER_HOST_LIST):
+            if id_ not in [i["id"] for i in self.get_docker_hosts()]:
+                raise UptimeKumaException("docker host does not exist")
             return self._call('deleteDockerHost', id_)
 
     # maintenance
@@ -3355,7 +3380,10 @@ class UptimeKumaApi(object):
                 "msg": "Deleted Successfully."
             }
         """
-        return self._call('deleteMaintenance', id_)
+        with self.wait_for_event(Event.MAINTENANCE_LIST):
+            if id_ not in [i["id"] for i in self.get_maintenances()]:
+                raise UptimeKumaException("maintenance does not exist")
+            return self._call('deleteMaintenance', id_)
 
     def pause_maintenance(self, id_: int) -> dict:
         """
@@ -3672,6 +3700,8 @@ class UptimeKumaApi(object):
             }
         """
         with self.wait_for_event(Event.API_KEY_LIST):
+            if id_ not in [i["id"] for i in self.get_api_keys()]:
+                raise UptimeKumaException("api key does not exist")
             return self._call('deleteAPIKey', id_)
 
     # helper methods