diff --git a/server/plugins/mikrotik_scan/mikrotik.py b/server/plugins/mikrotik_scan/mikrotik.py
index 1bb566c8..3a6ca136 100755
--- a/server/plugins/mikrotik_scan/mikrotik.py
+++ b/server/plugins/mikrotik_scan/mikrotik.py
@@ -7,7 +7,7 @@ import sys
 INSTALL_PATH = os.getenv('NETALERTX_APP', '/app')
 sys.path.extend([f"{INSTALL_PATH}/server/plugins", f"{INSTALL_PATH}/server"])
 
-from plugin_helper import Plugin_Objects  # noqa: E402 [flake8 lint suppression]
+from plugin_helper import Plugin_Objects, normalize_mac  # noqa: E402 [flake8 lint suppression]
 from logger import mylog, Logger  # noqa: E402 [flake8 lint suppression]
 from helper import get_setting_value  # noqa: E402 [flake8 lint suppression]
 from const import logPath  # noqa: E402 [flake8 lint suppression]
@@ -64,16 +64,17 @@ def get_entries(plugin_objects: Plugin_Objects) -> Plugin_Objects:
         for lease in leases:
             lease_id = lease.get('.id')
             address = lease.get('address')
-            mac_address = lease.get('mac-address').lower()
+            raw_mac_address = lease.get('mac-address')
             host_name = lease.get('host-name')
             comment = lease.get('comment')
             last_seen = lease.get('last-seen')
             status = lease.get('status')
             device_name = comment or host_name or "(unknown)"
 
-            mylog('verbose', f"ID: {lease_id}, Address: {address}, MAC: {mac_address}, Host Name: {host_name}, Comment: {comment}, Last Seen: {last_seen}, Status: {status}")
+            mylog('verbose', f"ID: {lease_id}, Address: {address}, MAC: {raw_mac_address}, Host Name: {host_name}, Comment: {comment}, Last Seen: {last_seen}, Status: {status}")
 
-            if (status == "bound"):
+            if status == "bound" and raw_mac_address:
+                mac_address = normalize_mac(raw_mac_address)
                 plugin_objects.add_object(
                     primaryId   = mac_address,
                     secondaryId = address,
diff --git a/test/plugins/test_mikrotik_scan.py b/test/plugins/test_mikrotik_scan.py
new file mode 100644
index 00000000..f7d20505
--- /dev/null
+++ b/test/plugins/test_mikrotik_scan.py
@@ -0,0 +1,83 @@
+"""Tests for the MikroTik DHCP lease scanner."""
+
+import importlib.util
+import sys
+import types
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+
+def _load_mikrotik_module():
+    stubbed_module_names = []
+
+    def stub(name, **attributes):
+        module = types.ModuleType(name)
+        for attribute, value in attributes.items():
+            setattr(module, attribute, value)
+        sys.modules[name] = module
+        stubbed_module_names.append(name)
+
+    class TrapError(Exception):
+        pass
+
+    stub(
+        "plugin_helper",
+        Plugin_Objects=MagicMock,
+        normalize_mac=lambda mac: mac.strip().lower(),
+    )
+    stub("logger", mylog=MagicMock(), Logger=MagicMock())
+    stub("helper", get_setting_value=MagicMock(return_value="UTC"))
+    stub("const", logPath="/tmp")
+    stub("conf", tz=None)
+    stub("pytz", timezone=MagicMock(return_value="UTC"))
+    stub("librouteros", connect=MagicMock())
+    stub("librouteros.exceptions", TrapError=TrapError)
+
+    module_path = Path(__file__).resolve().parents[2] / "server" / "plugins" / "mikrotik_scan" / "mikrotik.py"
+    spec = importlib.util.spec_from_file_location("mikrotik_scan", module_path)
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+
+    for name in stubbed_module_names:
+        sys.modules.pop(name, None)
+
+    return module
+
+
+mikrotik = _load_mikrotik_module()
+
+
+def _lease(lease_id, address, mac_address, status="bound"):
+    lease = {
+        ".id": lease_id,
+        "address": address,
+        "host-name": f"device-{lease_id}",
+        "comment": "",
+        "last-seen": "1m",
+        "status": status,
+    }
+    if mac_address is not None:
+        lease["mac-address"] = mac_address
+    return lease
+
+
+def test_disabled_lease_without_mac_does_not_abort_remaining_leases():
+    leases = [
+        _lease("*1", "192.168.1.2", "aa:bb:cc:dd:ee:01"),
+        _lease("*2", "192.168.1.5", None, status="waiting"),
+        _lease("*3", "192.168.1.8", "aa:bb:cc:dd:ee:03"),
+    ]
+    api = MagicMock(return_value=leases)
+    plugin_objects = MagicMock()
+
+    mikrotik.MT_USER = "user"
+    mikrotik.MT_PASS = "password"
+    mikrotik.MT_HOST = "192.168.1.1"
+    mikrotik.MT_PORT = 8728
+
+    with patch.object(mikrotik, "connect", return_value=api):
+        result = mikrotik.get_entries(plugin_objects)
+
+    assert result is plugin_objects
+    assert plugin_objects.add_object.call_count == 2
+    assert [call.kwargs["primaryId"] for call in plugin_objects.add_object.call_args_list] == ["aa:bb:cc:dd:ee:01", "aa:bb:cc:dd:ee:03"]