Unexpected token E in JSON at position 0

[chandrashekar3792]

SyntaxError: Unexpected token E in JSON at position 0
at Object.parse (native)
at ClientRequest.TopicRequest.https.request.on (/home/social/node_modules/fcm-node/lib/topic_request.js:24:18)
at emitOne (events.js:96:13)
at ClientRequest.emit (events.js:188:7)
at TLSSocket.socketOnEnd (_http_client.js:346:9)
at emitNone (events.js:91:20)
at TLSSocket.emit (events.js:185:7)
at endReadableNT (_stream_readable.js:974:12)
at _combinedTickCallback (internal/process/next_tick.js:74:11)
at process._tickDomainCallback (internal/process/next_tick.js:122:9)