The BIP147 reads:

Sigop cost is defined. The cost of a sigop in traditional script is 4, while the cost of a sigop in witness program is 1.

The new rule is total sigop cost ≤ 80,000.

But the code implements:

if (nSigOps + (nWitSigOps + 3) / 4 > MAX_BLOCK_SIGOPS)

 ... error....

nSigOps = 1
nWitSigOps =79999

Is not an error by BIP definition but it's an error by the implemented code.

Regards, Sergio.