Segmentation fault: On SUB socket.connect() in release builds

[eicm]

On release builds I get segmentation fault calling socket.connect(), while on debug builds it works fine:

int main(int argc, char* argv[]) {
  zmq::context_t context(1);
  zmq::socket_t socket(context, ZMQ_SUB);
  socket.setsockopt(ZMQ_SUBSCRIBE, "frame", 5);
  socket.connect("tcp://localhost:46461");
  return 0;
}