diff --git a/src/shared/db.js b/src/shared/db.js
index 11f17b8..c635d17 100644
--- a/src/shared/db.js
+++ b/src/shared/db.js
@@ -4,6 +4,8 @@ import Duration from 'dayjs/plugin/duration'
 import Dexie from 'dexie'
 import 'dexie-export-import'
 
+import { LogValidator, checkForErrors } from '../shared/validation'
+
 dj.extend(Duration)
 dj.extend(RelativeTime)
 
@@ -33,6 +35,8 @@ export async function insertLog({ timestamp, host, seconds }) {
   const saved = await DB.logs.where({ host, timestamp }).first()
   const data = Object.assign({ host, timestamp, seconds: 0 }, saved)
   data.seconds += seconds
+  const error = checkForErrors(LogValidator, data)
+  if (error) throw new Error(error)
   await DB.logs.put(data)
 }