issue with devtools

[arat3091]

i am getting the below error when enabling the dev tool extension. I saw someone saying this happens when Action payload is not serializable. But our problem is that we have lot of Actions and now how to find that one action also if at all this is the problem. Atleast it should point us to the Action

ypeError: toISOString is not a function TypeError: toISOString is not a function at String.toJSON () at Object. (_ctx.js:18) at derez (:2:5451) at derez (:2:6072) at derez (:2:6072) at derez (:2:6072) at derez (:2:5890) at derez (:2:6072) at derez (:2:6072) at derez (:2:6072) at String.toJSON () at Object. (_ctx.js:18) at derez (:2:5451) at derez (:2:6072) at derez (:2:6072) at derez (:2:6072) at derez (:2:5890) at derez (:2:6072) at derez (:2:6072) at derez (:2:6072) at resolvePromise (zone.js:824) at resolvePromise (zone.js:795) at zone.js:873 at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:425) at Object.onInvokeTask (core.es5.js:3881) at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:424) at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runTask (zone.js:192) at drainMicroTaskQueue (zone.js:602) at