Bug Description

When the Bot is mentioned in Slack, it throws: Cannot read properties of undefined (reading 'includes'). This happens when processing Slack message events with mentions.

Reproduction Steps

1. Mention @bot in any Slack channel
2. Error appears - Bot responds with the error message instead of processing normally

Environment

• OpenClaw version: 2026.3.1
• Platform: macOS
• Channel: Slack

Root Cause Analysis

After extensive investigation, the bug is in multiple locations in the bundled channel-web.js:

1. isBotMentionedFromTargets function - targets.normalizedMentions.includes() called without null check
2. stripMessageIdHints in chat-envelope.js - text.includes() without null check
3. Various uses of msg.body without null checks

The bug is intermittent - shorter messages like "hey" may work while longer ones crash. This suggests timing/async issues in how Slack delivers message payloads.

Patches Applied (but not persisting)

Multiple patches were attempted on dist files but they get overwritten on restart:

• channel-web-*.js: msg.body ?? ""
• chat-envelope-*.js: text || text.includes(...)

Recommended Fix

This needs to be fixed in the OpenClaw source code with proper null guards:

• Add optional chaining (?.) to all .includes() calls
• Add null coalescing (??) to message body accesses
• The fix should be in the TypeScript source, not the bundled JS

Workaround

None found - bug is in core framework code.