Multilined properties in quotes causes parsing to go wrong

[rcjsuen]

ENV 'ccc'='ddd' \
 'eee'='fff'

var dockerfileAst = require("dockerfile-ast")
var content = "ENV 'ccc'='ddd' \\\n 'eee'='fff'"
var dockerfile = dockerfileAst.DockerfileParser.parse(content)
var instruction = dockerfile.getInstructions()[0]
console.log(instruction.getProperties().length)

3 gets printed when it should be 2.