diff --git a/components/metrics/MetricCard.js b/components/metrics/MetricCard.js
index ad6c62eb..6209509c 100644
--- a/components/metrics/MetricCard.js
+++ b/components/metrics/MetricCard.js
@@ -4,7 +4,7 @@ import { formatNumber } from '../../lib/format';
 import styles from './MetricCard.module.css';
 
 const MetricCard = ({ value = 0, label, format = formatNumber }) => {
-  const props = useSpring({ x: value, from: { x: 0 } });
+  const props = useSpring({ x: Number(value) || 0, from: { x: 0 } });
 
   return (
     <div className={styles.card}>
diff --git a/lib/queries.js b/lib/queries.js
index d76cdaff..204b545b 100644
--- a/lib/queries.js
+++ b/lib/queries.js
@@ -299,7 +299,7 @@ export function getMetrics(website_id, start_at, end_at) {
     );
   }
 
-  return Promise.resolve({});
+  return Promise.reject(new Error('Unknown database.'));
 }
 
 export function getPageviews(
@@ -346,7 +346,7 @@ export function getPageviews(
     );
   }
 
-  return Promise.resolve([]);
+  return Promise.reject(new Error('Unknown database.'));
 }
 
 export function getRankings(website_id, start_at, end_at, type, table, domain) {
@@ -388,7 +388,7 @@ export function getRankings(website_id, start_at, end_at, type, table, domain) {
     );
   }
 
-  return Promise.resolve([]);
+  return Promise.reject(new Error('Unknown database.'));
 }
 
 export function getActiveVisitors(website_id) {
@@ -421,7 +421,7 @@ export function getActiveVisitors(website_id) {
     );
   }
 
-  return Promise.resolve([]);
+  return Promise.reject(new Error('Unknown database.'));
 }
 
 export function getEvents(website_id, start_at, end_at, timezone = 'utc', unit = 'day') {
@@ -465,5 +465,5 @@ export function getEvents(website_id, start_at, end_at, timezone = 'utc', unit =
     );
   }
 
-  return Promise.resolve([]);
+  return Promise.reject(new Error('Unknown database.'));
 }
diff --git a/pages/api/website/[id]/metrics.js b/pages/api/website/[id]/metrics.js
index 82ab393e..4b0d71e1 100644
--- a/pages/api/website/[id]/metrics.js
+++ b/pages/api/website/[id]/metrics.js
@@ -3,11 +3,14 @@ import { ok } from 'lib/response';
 
 export default async (req, res) => {
   const { id, start_at, end_at } = req.query;
+  const websiteId = +id;
+  const startDate = new Date(+start_at);
+  const endDate = new Date(+end_at);
 
-  const metrics = await getMetrics(+id, new Date(+start_at), new Date(+end_at));
+  const metrics = await getMetrics(websiteId, startDate, endDate);
 
   const stats = Object.keys(metrics[0]).reduce((obj, key) => {
-    obj[key] = +metrics[0][key];
+    obj[key] = Number(metrics[0][key]) || 0;
     return obj;
   }, {});