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VIX futures missing data after Feb-18

Is there a new code to reference VIX futures? I am able to reference vix futures up to Feb '18 but after that no data is returned.

vx_mult = symbols('VXG18')  
vx_mult.expiration_date 

Correct Result
Timestamp('2018-02-14 00:00:00+0000', tz='UTC')

vx_mult = symbols('VXH18')  
vx_mult.expiration_date  

NoSuchSymbolsTraceback (most recent call last)
in ()
----> 1 vx_mult = symbols('VXH18')
2 vx_mult.expiration_date

/build/src/qexec_repo/qexec/research/api.py in symbols(symbols, symbol_reference_date, handle_missing) 459 symbol_reference_date=symbol_reference_date,
460 handle_missing=handle_missing,
--> 461 readers=readers,
462 )
463

/build/src/qexec_repo/qexec/research/_api.pyc in inner_symbols(symbols, symbol_reference_date, handle_missing, readers) 274
275 if len(securities) == 0:
--> 276 raise NoSuchSymbols(symbols)
277
278 if symbols_is_scalar:

NoSuchSymbols: Failed to find securities matching ['VXH18']

Thanks!
Nate