Bug Description

Cron jobs with sessionTarget: 'main' and payload.kind: 'systemEvent' fail with the error:

TypeError: Cannot read properties of undefined (reading 'trim')

This affects the built-in morning-news and evening-news cron jobs. The error occurs immediately (duration 1ms) indicating a code path failure rather than a timeout.

Environment

• OpenClaw: 2026.3.13
• Channel: stable
• OS: Linux 6.8.0
• Node: v22.22.0
• Deploy type: VPS (Gateway only, no local UI)

Cron Job Config

{
  "id": "254045f3-1b09-4b1e-a88b-92ef85308fa1",
  "name": "morning-news",
  "sessionTarget": "main",
  "payload": {
    "kind": "systemEvent",
    "message": "晨间新闻提醒"
  }
}

Expected Behavior

systemEvent jobs targeting the main session should fire normally and deliver the message.

Actual Behavior

• Status: error
• Duration: 1ms (instant failure)
• Error: TypeError: Cannot read properties of undefined (reading 'trim')

Workaround

None known. Moving to isolated session with agentTurn works but loses channel context (WeChat delivery requires main session).

Related

• Root session can receive and deliver messages normally
• Gateway is functional (RPC reachable from local)
• Isolated agentTurn cron jobs execute correctly