diff --git a/src/html/api/index.php b/src/html/api/index.php
index b6eb043..5484c73 100644
--- a/src/html/api/index.php
+++ b/src/html/api/index.php
@@ -93,12 +93,12 @@ function saveEntry($id) {
     $statement=$connection->prepare("update entry set value_date=:value_date, operation_date=:operation_date, label=:label, value=:value, account_id=:account_id, category=:category where id=:id");
 
     $statement->bindParam("value_date", $entry['value_date']);
-    $statement->bindParam("operation_date", array_key_exists("operation_date", $entry) ? $entry['operation_date'] : null);
+    $statement->bindParam("operation_date", $entry['operation_date']);
     $statement->bindParam("label", $entry['label']);
     $statement->bindParam("value", $entry['value']);
     $statement->bindParam("account_id", $entry['account_id']);
     $statement->bindParam("id", $entry['id']);
-    $statement->bindParam("category", array_key_exists("category", $entry) ? $entry["category"] : null);
+    $statement->bindParam("category", $entry["category"]);
 
     $return=$statement->execute();