diff --git a/src/client.js b/src/client.js
index cec91725..3e97abae 100644
--- a/src/client.js
+++ b/src/client.js
@@ -1,5 +1,5 @@
 import * as sapper from '@sapper/app';
 
-sapper.start({
-	target: document.querySelector('#sapper')
-});
\ No newline at end of file
+const target = document.querySelector('#sapper');
+if (!target) throw new Error("Missing #sapper element");
+sapper.start({ target });