SyntaxError? Unexpected end of JSON input

Hi,
I am having the following error while trying to convert mendeley citations to paperpile citations (in word for mac)
Does anybody have a solution?
SyntaxError: Unexpected end of JSON input
at JSON.parse ()
at DocProcessor_DocProcessor.receiveJson (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:143717)
at DocProcessor_DocProcessor.handleRequest (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:139437)
at /Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11510485
at s. (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11532788)
at s.emit (events.js:210:5)
at s.EventEmitter.emit (domain.js:476:20)
at s.onclosetag (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11532123)
at E (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11548595)
at T (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11548634)
at N (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11551920)
at s.write (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11541141)
at s.parseString (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11533031)
at s.parseString (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11527594)
at IncomingMessage. (/Applications/Paperpile.app/Contents/Resources/app.asar/dist/main.js:2:11506036)
at IncomingMessage.emit (events.js:215:7)
at IncomingMessage.EventEmitter.emit (domain.js:476:20)
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