diff --git a/python/nav/web/seeddb/page/netbox/edit.py b/python/nav/web/seeddb/page/netbox/edit.py
index 2febc78184..209ac090cf 100644
--- a/python/nav/web/seeddb/page/netbox/edit.py
+++ b/python/nav/web/seeddb/page/netbox/edit.py
@@ -243,7 +243,7 @@ def get_sysname(ip_address):
     try:
         _, sysname = resolve_ip_and_sysname(ip_address)
         return sysname
-    except SocketError:
+    except (SocketError, UnicodeError):
         return None
 
 
diff --git a/python/nav/web/seeddb/page/netbox/forms.py b/python/nav/web/seeddb/page/netbox/forms.py
index fb882e0017..3dde54c40b 100644
--- a/python/nav/web/seeddb/page/netbox/forms.py
+++ b/python/nav/web/seeddb/page/netbox/forms.py
@@ -204,7 +204,7 @@ def clean_ip(self):
         name = self.cleaned_data['ip'].strip()
         try:
             ip, _ = resolve_ip_and_sysname(name)
-        except SocketError:
+        except (SocketError, UnicodeError):
             raise forms.ValidationError("Could not resolve name %s" % name)
         return str(ip)
 
diff --git a/tests/integration/seeddb_test.py b/tests/integration/seeddb_test.py
index 55bb0edcb7..b34f996646 100644
--- a/tests/integration/seeddb_test.py
+++ b/tests/integration/seeddb_test.py
@@ -5,6 +5,7 @@
 from django.test.client import RequestFactory
 from mock import MagicMock
 
+from nav.compatibility import smart_str
 from nav.models.manage import Netbox, Room
 from nav.web.seeddb.page.netbox.edit import netbox_edit, log_netbox_change
 from nav.web.seeddb.utils.delete import dependencies
@@ -28,6 +29,26 @@ def test_editing_deleted_netboxes_should_raise_404(admin_account):
         netbox_edit(request, netboxid)
 
 
+def test_adding_netbox_with_invalid_ip_should_fail(db, client):
+    url = reverse('seeddb-netbox-edit')
+    ip = "195.88.54.16'))) OR 2121=(SELECT COUNT(*) FROM GENERATE_SERIES(1,15000000)) AND ((('FRyc' LIKE 'FRyc"
+
+    response = client.post(
+        url,
+        follow=True,
+        data={
+            "ip": ip,
+            "room": "myroom",
+            "category": "GW",
+            "organization": "myorg",
+        },
+    )
+
+    assert response.status_code == 200
+    assert 'Form was not valid' in smart_str(response.content)
+    assert 'Could not resolve name' in smart_str(response.content)
+
+
 @pytest.fixture()
 def netbox(management_profile):
     box = Netbox(