diff --git a/data.php b/data.php
index aeba20f4..2451619a 100644
--- a/data.php
+++ b/data.php
@@ -68,6 +68,16 @@
 
         $domains_over_time = overTime10mins($dns_queries);
         $ads_over_time = overTime10mins($ads_blocked);
+
+        // Provide a minimal valid array if there have are no blocked
+        // queries at all. Otherwise the output of the API is inconsistent.
+        if(count($ads_blocked) == 0)
+        {
+            $ads_over_time = [1 => 0];
+        }
+
+        print_r($domains_over_time);
+
         alignTimeArrays($ads_over_time, $domains_over_time);
         return Array(
             'domains_over_time' => $domains_over_time,