diff --git a/backend/btrixcloud/orgs.py b/backend/btrixcloud/orgs.py
index 7f90ee68..5e98ce61 100644
--- a/backend/btrixcloud/orgs.py
+++ b/backend/btrixcloud/orgs.py
@@ -500,8 +500,12 @@ def init_orgs_api(app, mdb, user_manager, invites, user_dep: User):
                 raise HTTPException(
                     status_code=400, detail="Can't remove only owner from org"
                 )
+        try:
+            del org.users[str(other_user.id)]
+        except KeyError:
+            # pylint: disable=raise-missing-from
+            raise HTTPException(status_code=404, detail="no_such_org_user")
 
-        del org.users[str(other_user.id)]
         await ops.update(org)
         return {"removed": True}
 
diff --git a/backend/test/test_org.py b/backend/test/test_org.py
index af933b70..b78e3c90 100644
--- a/backend/test/test_org.py
+++ b/backend/test/test_org.py
@@ -116,6 +116,18 @@ def test_remove_user_from_org(admin_auth_headers, default_org_id):
     assert data["removed"]
 
 
+def test_remove_non_existent_user(admin_auth_headers, default_org_id):
+    # Remove user
+    r = requests.post(
+        f"{API_PREFIX}/orgs/{default_org_id}/remove",
+        json={"email": "toremove@example.com"},
+        headers=admin_auth_headers,
+    )
+    assert r.status_code == 404
+    data = r.json()
+    assert data["detail"] == "no_such_org_user"
+
+
 def test_get_pending_org_invites(
     admin_auth_headers, default_org_id, non_default_org_id
 ):