From c20bc8abc454b2ec93cf10e2e16f267cba3b84a7 Mon Sep 17 00:00:00 2001
From: Johan Haals <johan.haals@gmail.com>
Date: Fri, 5 Mar 2021 09:54:27 +0100
Subject: [PATCH] Don't json parse undefined input

Signed-off-by: Johan Haals <johan.haals@gmail.com>
---
 .../src/scaffolder/tasks/TaskWorker.ts                   | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/plugins/scaffolder-backend/src/scaffolder/tasks/TaskWorker.ts b/plugins/scaffolder-backend/src/scaffolder/tasks/TaskWorker.ts
index 4d8f652ae0..bd0a418598 100644
--- a/plugins/scaffolder-backend/src/scaffolder/tasks/TaskWorker.ts
+++ b/plugins/scaffolder-backend/src/scaffolder/tasks/TaskWorker.ts
@@ -98,9 +98,9 @@ export class TaskWorker {
             throw new Error(`Action '${step.action}' does not exist`);
           }
 
-          const input = JSON.parse(
-            JSON.stringify(step.input),
-            (_key, value) => {
+          const input =
+            step.input &&
+            JSON.parse(JSON.stringify(step.input), (_key, value) => {
               if (typeof value === 'string') {
                 return handlebars.compile(value, {
                   noEscape: true,
@@ -110,8 +110,7 @@ export class TaskWorker {
                 })(templateCtx);
               }
               return value;
-            },
-          );
+            });
 
           if (action.schema?.input) {
             const validateResult = validateJsonSchema(input, action.schema, {