diff --git a/functions/functions.php b/functions/functions.php
index 750d41a..43e7da7 100644
--- a/functions/functions.php
+++ b/functions/functions.php
@@ -28,6 +28,10 @@ function get_aggregation(mysqli $db, string $table, $date): array
     $value_result = $db->query($value_query);
 
     $values = [];
+    $values['avg_meter'] = 0;
+    $values['avg_power'] = 0;
+    $values['avg_feed'] = 0;
+    $values['avg_production'] = 0;
     while ($row = $value_result->fetch_assoc()) {
         $production = ($row['production_eg'] + $row['production_og']);
         $values['date'][] = $row['date'];