刚刚接触koa，运行后正常。但chrome会报错。求大牛们解答

		Error in event handler for (unknown): Unexpected token h
		Stack trace: SyntaxError: Unexpected token h
			at Object.parse (native)
			at chrome-extension://gbmdgpbipfallnflgajpaliibnhdgobh/assets/all.js:1:2709
			at messageListener (extensions::messaging:340:9)
			at EventImpl.dispatchToListener (extensions::event_bindings:397:22)
			at Event.publicClass.(anonymous function) [as dispatchToListener] (extensions::utils:93:26)
			at EventImpl.dispatch_ (extensions::event_bindings:379:35)
			at EventImpl.dispatch (extensions::event_bindings:403:17)
			at Event.publicClass.(anonymous function) [as dispatch] (extensions::utils:93:26)
			at dispatchOnMessage (extensions::messaging:304:22) localhost/:1