diff --git a/app/Support/Form/CurrencyForm.php b/app/Support/Form/CurrencyForm.php
index e27d167150..ad5fa7eef4 100644
--- a/app/Support/Form/CurrencyForm.php
+++ b/app/Support/Form/CurrencyForm.php
@@ -75,6 +75,9 @@ class CurrencyForm
 
         // perhaps the currency has been sent to us in the field $amount_currency_id_$name (amount_currency_id_amount)
         $preFilled      = session('preFilled');
+        if (!is_array($preFilled)) {
+            $preFilled = [];
+        }
         $key            = 'amount_currency_id_' . $name;
         $sentCurrencyId = array_key_exists($key, $preFilled) ? (int)$preFilled[$key] : $defaultCurrency->id;
 
@@ -140,7 +143,10 @@ class CurrencyForm
         unset($options['currency'], $options['placeholder']);
 
         // perhaps the currency has been sent to us in the field $amount_currency_id_$name (amount_currency_id_amount)
-        $preFilled      = session('preFilled');
+        $preFilled = session('preFilled');
+        if (!is_array($preFilled)) {
+            $preFilled = [];
+        }
         $key            = 'amount_currency_id_' . $name;
         $sentCurrencyId = array_key_exists($key, $preFilled) ? (int)$preFilled[$key] : $defaultCurrency->id;