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For the compressor handling Helium between pressures of 0.65 and 15 bar and the inlet temperature of 252.23 C (to give h=1180 at inlet), the outlet temperature should be 1571 C to give an isentropic efficiency of 100%. If the exit temperature is more than that, the isentropic efficiency will be less than 100%.
At isentropic efficiency of 100%, the exit enthalpy would be 8027 kJ/kg.
So, in your case, since the exit enthalpy is less than 8027, the isentropic efficiency is greater than 100% implying that entropy is destroyed which is against 2nd law.