It would depend on the resolution of the failure *and* if there was going to be a second roll for dash anyway.
If the character in climbing uses dash, do you normally require a roll for the regular move and dash? Does he require two climbing checks? If so, then if the first failure was "did not advance" then yes a second roll is fine - it would have happened either way.
But if you have shown only one climb check is needed to cover the long climb, regular plus dash, then one fail means no go for both just like one success would cover both.