TypeError: Cannot read property 'length' of undefined

[ainthek]

$ ./mongo-admin/script/_require/bin/find-dependants $(git ls-files "BL/upm2-script/src/install/mongo/data/**/*.js")
.../node_modules/browserify-tree/index.js:150
this.srclen = this.packEntry.source.length;
^

TypeError: Cannot read property 'length' of undefined
at TreeNode.calcSrcLen (.../node_modules/browserify-tree/index.js:150:44)
at TreeNode.resolveDeps (.../node_modules/browserify-tree/index.js:231:18)
at new TwoWayPackEntryList (.../node_modules/browserify-tree/index.js:335:92)
at unpackBundle (.../node_modules/browserify-tree/index.js:96:12)
at Object.exports.drawTree (.../node_modules/browserify-tree/index.js:8:33)
at Object. (.../node_modules/browserify-tree/cli.js:34:28)
at Module._compile (module.js:556:32)
at Object.Module._extensions..js (module.js:565:10)
at Module.load (module.js:473:32)
at tryModuleLoad (module.js:432:12)