diff --git a/x-pack/legacy/plugins/painless_playground/public/components/editor.tsx b/x-pack/legacy/plugins/painless_playground/public/components/editor.tsx
index bc5fabf4f309b..1a9ba18fa7dc0 100644
--- a/x-pack/legacy/plugins/painless_playground/public/components/editor.tsx
+++ b/x-pack/legacy/plugins/painless_playground/public/components/editor.tsx
@@ -21,7 +21,7 @@ export function Editor({ code, setCode, renderMainControls }: Props) {
         <EuiPageContent panelPaddingSize="s">
           <CodeEditor
             languageId="painless"
-            height={250}
+            height={380}
             value={code}
             onChange={setCode}
             options={{
diff --git a/x-pack/legacy/plugins/painless_playground/public/components/painless_playground.tsx b/x-pack/legacy/plugins/painless_playground/public/components/painless_playground.tsx
index 7becc127e20f7..292aedc54bfa1 100644
--- a/x-pack/legacy/plugins/painless_playground/public/components/painless_playground.tsx
+++ b/x-pack/legacy/plugins/painless_playground/public/components/painless_playground.tsx
@@ -113,7 +113,7 @@ export function PainlessPlayground({
             ]}
           />
         </EuiFlexItem>
-        {response.error || response.result ? (
+        {response.error || typeof response.result !== 'undefined' ? (
           <EuiFlexItem>
             <Output response={response} />
           </EuiFlexItem>
diff --git a/x-pack/legacy/plugins/painless_playground/public/components/settings.tsx b/x-pack/legacy/plugins/painless_playground/public/components/settings.tsx
index 654831fe138e4..8ea2c9929da29 100644
--- a/x-pack/legacy/plugins/painless_playground/public/components/settings.tsx
+++ b/x-pack/legacy/plugins/painless_playground/public/components/settings.tsx
@@ -79,7 +79,7 @@ export function Settings({
             <div style={{ border: '1px solid #D3DAE6', padding: '3px' }}>
               <CodeEditor
                 languageId="javascript"
-                height={100}
+                height={150}
                 value={contextSetup.params}
                 onChange={(value: string) => setContextSetup({ params: value })}
                 options={{
diff --git a/x-pack/legacy/plugins/painless_playground/public/lib/helpers.ts b/x-pack/legacy/plugins/painless_playground/public/lib/helpers.ts
index af288ea53b275..43edd08fd043e 100644
--- a/x-pack/legacy/plugins/painless_playground/public/lib/helpers.ts
+++ b/x-pack/legacy/plugins/painless_playground/public/lib/helpers.ts
@@ -30,7 +30,7 @@ export function buildRequestPayload(
     request.context = context;
     request.context_setup = {
       index: contextSetup.index,
-      document: parseJSON(contextSetup.doc),
+      document: parseJSON(contextSetup.document),
     };
     return request;
   }