diff --git a/src/html/api/index.php b/src/html/api/index.php
index df01b10..b6eb043 100644
--- a/src/html/api/index.php
+++ b/src/html/api/index.php
@@ -72,11 +72,11 @@ function addEntry() {
     $statement=$connection->prepare("insert into entry (value_date, operation_date, label, value, account_id, category) values (:value_date, :operation_date, :label, :value, :account_id, :category)");
 
     $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("category", array_key_exists("category", $entry) ? $entry["category"] : null);
+    $statement->bindParam("category", $entry["category"]);
 
     $return=$statement->execute();