npm fails to deprecate generic-diff-context

npm-debug.log

0 info it worked if it ends with ok
1 verbose cli [ '/usr/bin/nodejs',
1 verbose cli   '/usr/bin/npm',
1 verbose cli   'deprecate',
1 verbose cli   '.',
1 verbose cli   'gdc.splitFinalLfPart duplicates the entire part even if it\'s huge' ]
2 info using npm@3.10.10
3 info using node@v6.9.3
4 silly mapToRegistry name null
5 verbose stack AssertionError: 'object' == 'string'
5 verbose stack     at npa (/usr/lib/node_modules/npm/node_modules/npm-package-arg/npa.js:41:10)
5 verbose stack     at mapToRegistry (/usr/lib/node_modules/npm/lib/utils/map-to-registry.js:13:14)
5 verbose stack     at EventEmitter.deprecate (/usr/lib/node_modules/npm/lib/deprecate.js:44:3)
5 verbose stack     at Object.commandCache.(anonymous function) (/usr/lib/node_modules/npm/lib/npm.js:124:13)
5 verbose stack     at EventEmitter.<anonymous> (/usr/lib/node_modules/npm/bin/npm-cli.js:73:30)
5 verbose stack     at _combinedTickCallback (internal/process/next_tick.js:67:7)
5 verbose stack     at process._tickCallback (internal/process/next_tick.js:98:9)
6 verbose cwd /…/modules/generic-diff-context
7 error Linux 3.13.0-97-generic
8 error argv "/usr/bin/nodejs" "/usr/bin/npm" "deprecate" "." "gdc.splitFinalLfPart duplicates the entire part even if it's huge"
9 error node v6.9.3
10 error npm  v3.10.10
11 error 'object' == 'string'
12 error If you need help, you may report this error at:
12 error     <https://github.com/npm/npm/issues>
13 verbose exit [ 1, true ]