diff --git a/packages/builder/src/components/design/settings/controls/ButtonActionEditor/ButtonActionEditor.svelte b/packages/builder/src/components/design/settings/controls/ButtonActionEditor/ButtonActionEditor.svelte
index 331d9e4c5d..f8fb385eb3 100644
--- a/packages/builder/src/components/design/settings/controls/ButtonActionEditor/ButtonActionEditor.svelte
+++ b/packages/builder/src/components/design/settings/controls/ButtonActionEditor/ButtonActionEditor.svelte
@@ -52,7 +52,7 @@
       )
 
       newBlock.inputs = {
-        fields: Object.keys(parameters.fields).reduce((fields, key) => {
+        fields: Object.keys(parameters.fields ?? {}).reduce((fields, key) => {
           fields[key] = "string"
           return fields
         }, {}),