diff --git a/CRM/Core/Form.php b/CRM/Core/Form.php
index c5768709cfdb..3d52eb9b7b25 100644
--- a/CRM/Core/Form.php
+++ b/CRM/Core/Form.php
@@ -1804,6 +1804,10 @@ public function addCurrency(
     $setDefaultCurrency = TRUE
   ) {
     $currencies = CRM_Core_OptionGroup::values('currencies_enabled');
+    if (!array_key_exists($defaultCurrency, $currencies)) {
+      Civi::log()->warning('addCurrency: Currency ' . $defaultCurrency . ' is disabled but still in use!');
+      $currencies[$defaultCurrency] = $defaultCurrency;
+    }
     $options = array('class' => 'crm-select2 eight');
     if (!$required) {
       $currencies = array('' => '') + $currencies;