QGSJetII particle ID -10 cannot be converted

When I run showers with QGSJetII I get crashes after a few interactions:

terminate called after throwing an instance of 'std::runtime_error'
  what():  QGSJETII/CORSIKA conversion of pCodeInt=-10 impossible

In the PID table file there is a line:

# Eta        -10 1 there is no anti-eta