Bug Report

Version: OpenClaw Mac App 2026.3.8-beta.1 (Build 2026030801)
Platform: macOS 26.3.1 (25D2128), Mac16,12 (MacBook Air M4), ARM-64
Severity: Critical — App crashes immediately on launch

Description

The OpenClaw Mac App (Node mode) crashes repeatedly with SIGABRT when processing a browser proxy invoke from the Gateway. The crash is 100% reproducible — the app crashes within ~3 seconds of launching.

Crash Stack Trace (Key Frames)

Thread 6 Crashed (com.apple.root.default-qos.cooperative):

Exception Type: EXC_CRASH (SIGABRT)
Termination Reason: Namespace SIGNAL, Code 6, Abort trap: 6

Last Exception Backtrace:
  Foundation    +[NSJSONSerialization dataWithJSONObject:options:error:]
  OpenClaw      static MacNodeBrowserProxy.makeRequest(params:endpoint:) + 4296
  OpenClaw      MacNodeBrowserProxy.request(paramsJSON:) + 120
  OpenClaw      MacNodeRuntime.handleBrowserProxyInvoke(_:)
  OpenClaw      MacNodeRuntime.handleInvoke(_:)
  OpenClaw      closure #4 in MacNodeModeCoordinator.run()
  OpenClaw      GatewayNodeSession.invokeWithTimeout(request:timeoutMs:onInvoke:)

Root Cause Analysis

MacNodeBrowserProxy.makeRequest(params:endpoint:) constructs a Swift Dictionary that gets bridged to NSDictionary and passed to NSJSONSerialization.dataWithJSONObject. The dictionary contains a value that is not a valid JSON type (likely nil, an unbridgeable Swift enum/struct, or a non-serializable type), causing _writeJSONValue to throw an NSInvalidArgumentException.

The exception is not caught, propagating through:

1. _SwiftDeferredNSDictionary.enumerateKeysAndObjects — iterating dict entries
2. _writeJSONValue — fails on invalid value
3. objc_exception_throw → __cxa_throw → std::__terminate → abort()

Suggested Fix

Either:

1. Validate/sanitize the params dictionary before JSON serialization (filter out nil/non-JSON values)
2. Wrap NSJSONSerialization call in do-catch and return an error response instead of crashing
3. Use JSONSerialization.isValidJSONObject() as a pre-check

Steps to Reproduce

1. Install OpenClaw Mac App 2026.3.8-beta.1 on a Mac
2. Pair with a Gateway as a Node
3. Gateway sends a browser proxy invoke
4. App crashes within 3 seconds of connecting

Environment

• Hardware: MacBook Air M4 (Mac16,12)
• OS: macOS 26.3.1 (25D2128)
• OpenClaw: 2026.3.8-beta.1 (2026030801)
• SIP: enabled
• Incident ID: D0672842-527D-4E83-A3D6-E5EF9A46308E