Weird memory error form Roots --watch

error.log

compiling... done!
2016-02-12 08:30:58.780 node[4632:79460] -[__NSCFNumber _fastCStringContents:]: unrecognized selector sent to instance 0x67
2016-02-12 08:30:58.783 node[4632:79460] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber _fastCStringContents:]: unrecognized selector sent to instance 0x67'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff9316fae2 __exceptionPreprocess + 178
	1   libobjc.A.dylib                     0x00007fff984f373c objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff93172b9d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
	3   CoreFoundation                      0x00007fff930ab601 ___forwarding___ + 1009
	4   CoreFoundation                      0x00007fff930ab188 _CF_forwarding_prep_0 + 120
	5   fse.node                            0x0000000102ae96ad _Z15async_propagateP10uv_async_s + 163
	6   node                                0x0000000100494b58 uv__async_event + 65
	7   node                                0x0000000100494cdb uv__async_io + 136
	8   node                                0x00000001004a2b59 uv__io_poll + 1579
	9   node                                0x0000000100495186 uv_run + 335
	10  node                                0x000000010043618c _ZN4node5StartEiPPc + 344
	11  node                                0x00000001000019b4 start + 52
	12  ???                                 0x0000000000000003 0x0 + 3
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Abort trap: 6