Subscription machine crashes out in publishData whenever a PATCH succeeds

[timbl]

TypeError: undefined is not a function
at Object.exports.publishDelta (/devel/github.com/linkeddata/ldnode/subscription.js:147:5)
at /devel/github.com/linkeddata/ldnode/handlers/patch.js:123:34
at doPatch (/devel/github.com/linkeddata/ldnode/node_modules/rdflib/dist/rdflib.js:4340:9)
at $rdf.IndexedFormula.applyPatch (/devel/github.com/linkeddata/ldnode/node_modules/rdflib/dist/rdflib.js:4369:9)
at handler (/devel/github.com/linkeddata/ldnode/handlers/patch.js:108:22)
at Layer.handle as handle_request
at next (/devel/github.com/linkeddata/ldnode/node_modules/express/lib/router/route.js:131:13)
at Route.dispatch (/devel/github.com/linkeddata/ldnode/node_modules/express/lib/router/route.js:112:3)
at Layer.handle as handle_request
at /devel/github.com/linkeddata/ldnode/node_modules/express/lib/router/index.js:277:22

[timbl]

This bug has been around for a while.

[nicola]

I haven't gone through subscription.js yet, thanks for pointing out

[nicola]

Hey @timbl, does this still happen?

[nicola]

I can't replicate that, I assume this is now old