debug.chaindbProperty returns redundant characters 'undefined'

[sigrlot]

Only appears in the JS console:

debug.chaindbProperty("leveldb.stats")
Compactions
Level | Tables | Size(MB) | Time(sec) | Read(MB) | Write(MB)
-------+------------+---------------+---------------+---------------+---------------
0 | 1 | 0.00407 | 0.00000 | 0.00000 | 0.00000
-------+------------+---------------+---------------+---------------+---------------
Total | 1 | 0.00407 | 0.00000 | 0.00000 | 0.00000

undefined

version: 0.17.0