diff --git a/backend.php b/backend.php
index e4dd4fea1..3578871e6 100644
--- a/backend.php
+++ b/backend.php
@@ -748,7 +748,9 @@
 		}
 
 		if ($subop == "sanityCheck") {
-			sanity_check($link);
+			if (sanity_check($link)) {
+				print "<error error-code=\"0\"/>";
+			}
 		}
 
 		if ($subop == "globalPurge") {
diff --git a/tt-rss.js b/tt-rss.js
index 85c4564df..283412623 100644
--- a/tt-rss.js
+++ b/tt-rss.js
@@ -111,6 +111,8 @@ function backend_sanity_check_callback() {
 	if (xmlhttp.readyState == 4) {
 
 		try {
+
+			alert(xmlhttp.responseText);
 		
 			if (!xmlhttp.responseXML) {
 				fatalError(3);