Add an early return if `_gstate2.new_ram_per_block == 0` which is the case now: See also in [reference-contracts](https://github.com/AntelopeIO/reference-contracts/issues/108) https://github.com/eosnetworkfoundation/eos-system-contracts/blob/8ecd1ac6d312085279cafc9c1a5ade6affc886da/contracts/eosio.system/src/eosio.system.cpp#L93-L109