diff --git a/sys0-code/app/overview.php b/sys0-code/app/overview.php
index 92ce99e..65329b2 100644
--- a/sys0-code/app/overview.php
+++ b/sys0-code/app/overview.php
@@ -150,7 +150,7 @@ function load_user()
 						$userid=$_SESSION["id"];
 						if(isset($json['job']['filament']['tool0']['length'])){
 							$filament_usage=intval($json['job']['filament']['tool0']['length']);
-							$sql="UPDATE users SET filament_usage = filament_usage + $filament_usage WHERE id = $userid";
+							$sql="UPDATE users SET filament_usage = COALESCE(filament_usage,0) + $filament_usage WHERE id = $userid";
 							//echo($sql);
 							$stmt = mysqli_prepare($link, $sql);
                                                 	mysqli_stmt_execute($stmt);