Fix segfault.
Fix segfault.


chenmoshushi/mlpack,BookChan/mlpack,trungda/mlpack,lezorich/mlpack,ersanliqiao/mlpack,ranjan1990/mlpack,datachand/mlpack,darcyliu/mlpack,erubboli/mlpack,bmswgnp/mlpack,theranger/mlpack,ersanliqiao/mlpack,ranjan1990/mlpack,Azizou/mlpack,ranjan1990/mlpack,lezorich/mlpack,erubboli/mlpack,bmswgnp/mlpack,Azizou/mlpack,chenmoshushi/mlpack,palashahuja/mlpack,erubboli/mlpack,trungda/mlpack,datachand/mlpack,thirdwing/mlpack,darcyliu/mlpack,ersanliqiao/mlpack,ajjl/mlpack,BookChan/mlpack,datachand/mlpack,trungda/mlpack,minhpqn/mlpack,thirdwing/mlpack,stereomatchingkiss/mlpack,palashahuja/mlpack,theranger/mlpack,ajjl/mlpack,minhpqn/mlpack,theranger/mlpack,lezorich/mlpack,minhpqn/mlpack,stereomatchingkiss/mlpack,darcyliu/mlpack,chenmoshushi/mlpack,Azizou/mlpack,stereomatchingkiss/mlpack,ajjl/mlpack,bmswgnp/mlpack,BookChan/mlpack,palashahuja/mlpack,thirdwing/mlpack