diff --git a/src/leo-client-app/src/components/SchedulerTerminal.tsx b/src/leo-client-app/src/components/SchedulerTerminal.tsx
index 24406fe..88d3f31 100644
--- a/src/leo-client-app/src/components/SchedulerTerminal.tsx
+++ b/src/leo-client-app/src/components/SchedulerTerminal.tsx
@@ -65,7 +65,7 @@ const SchedulerTerminal = ({ disabled = false }: Props) => {
     });
 
     // Split string by lines
-    const messages = res.output?.toString().split("\n") ?? "";
+    const messages = res?.output?.toString().split("\n") ?? "";
 
     return (
       <Stack gap={1}>
diff --git a/src/leo-client-app/src/pages/test-playground/index.tsx b/src/leo-client-app/src/pages/test-playground/index.tsx
index 00fae2e..35fea3d 100644
--- a/src/leo-client-app/src/pages/test-playground/index.tsx
+++ b/src/leo-client-app/src/pages/test-playground/index.tsx
@@ -53,7 +53,7 @@ function TestPlayground() {
 
     const res = await sendCommand(commandReq);
 
-    const messages = res.output?.toString().split("\n") ?? "";
+    const messages = res?.output?.toString().split("\n") ?? "";
 
     return (
       <Stack gap={1}>