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Latest update results in: Cannot read property 'constructor' of undefined with angularJs project

See original GitHub issue

/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/gulp-sourcemaps/index.js:156
              } else if (ast[key].constructor === Array) {
                                 ^
TypeError: Cannot read property 'constructor' of undefined
    at registerTokens (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/gulp-sourcemaps/index.js:156:34)
    at registerTokens (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/gulp-sourcemaps/index.js:158:19)
    at registerTokens (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/gulp-sourcemaps/index.js:155:17)
    at DestroyableTransform.sourceMapInit [as _transform] (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/gulp-sourcemaps/index.js:164:9)
    at DestroyableTransform.Transform._read (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:159:10)
    at DestroyableTransform.Transform._write (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/through2/node_modules/readable-stream/lib/_stream_transform.js:147:83)
    at doWrite (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:313:64)
    at writeOrBuffer (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:302:5)
    at DestroyableTransform.Writable.write (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/through2/node_modules/readable-stream/lib/_stream_writable.js:241:11)
    at write (/home/httpd/vhosts/amy-468.my.daisycon.com/node_modules/gulp/node_modules/vinyl-fs/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:623:24)