Bad use of underscore method causing a crash

[Fen747]

Hi,

I'm having this fatal error on my server :

message: Cannot use 'in' operator to search for 'message' in undefined stack: TypeError: Cannot use 'in' operator to search for 'message' in undefined at packages/underscore/underscore.js:860:1 at Array.forEach (native) at _.each._.forEach (packages/underscore/underscore.js:105:1) at Function._.pick (packages/underscore/underscore.js:859:1) at Subscription.subscriptionProto.error (packages/meteorhacks_kadira/lib/hijack/wrap_subscription.js:51:1) at Subscription._runHandler (packages/ddp-server/livedata_server.js:1033:12) at Subscription.MeteorX.Subscription._runHandler (packages/meteorhacks_unblock/packages/meteorhacks_unblock.js:55:1) at Subscription.subscriptionProto._runHandler (packages/meteorhacks_kadira/lib/hijack/wrap_subscription.js:12:1) at Session.MeteorX.Session._startSubscription (packages/meteorhacks_unblock/packages/meteorhacks_unblock.js:43:1) at Session.sub (packages/ddp-server/livedata_server.js:617:12)

It seems that in this file, line 51, a call is made to underscore's _.pick method (line 856), which then use the in operator on the objargument, which is undefined, causing my app to crash.

I haven't changed my code for something like 4 or 5 days, and the error started to happen last night.

I've no idea how to correct that or why it happens now. My app keeps crashing now on a certain user action (it seems), unknown to me, and I'm totally unaware of how to solve that. But it seems that the problem really comes from Kadira, which pass an undefined parameter to _.pick.

[Fen747]

Okay, I have commented the Kadira package until I solve this.

Thanks to MeteorX and a lot of code reading (MeteorX's very smartly built btw), I've been able to see that the err undefined parameter comes from the internal Subscription prototype, which is itself called with an undefined error. But I'm still unable to know why or where (in my app).

It'd be great if the error stack trace was more explicit on server errors, like with a Zones.js for server for example.

[actionnick]

Also having this issue @Fen747, did you ever end up figuring out how to resolve it?

[btbjosh]

Also having this issue on all deployments with Meteor 1.4.2.1

[haunguyen90]

@Fen747 Do you have any ideas of how to fix it ?