diff --git a/R/MVP.Data.r b/R/MVP.Data.r
index 17a0c57..5aaa77a 100755
--- a/R/MVP.Data.r
+++ b/R/MVP.Data.r
@@ -183,6 +183,8 @@ MVP.Data <- function(fileMVP = NULL, fileVCF = NULL, fileHMP = NULL, fileBed = N
             sep = sep.kin,
             cpu = ncpus
         )
+    }else{
+        K <- NULL
     }
     
     # get pc
diff --git a/R/MVP.PCA.r b/R/MVP.PCA.r
index 77430d4..9485120 100755
--- a/R/MVP.PCA.r
+++ b/R/MVP.PCA.r
@@ -60,7 +60,7 @@ function(M=NULL, K=NULL, maxLine=10000, ind_idx=NULL, mrk_idx=NULL, pcs.keep=5,
     if(is.null(K)){
         K <- MVP.K.VanRaden(M=M, ind_idx = ind_idx, mrk_idx = mrk_idx, maxLine = maxLine, cpu = cpu, verbose = verbose)
     }else{
-        K <- K[ind_idx, ind_idx]
+        if(!is.null(ind_idx))    K <- K[ind_idx, ind_idx]
     }
 
     logging.log("Eigen Decomposition on GRM", "\n", verbose = verbose)
diff --git a/src/mvp_omp.h b/src/mvp_omp.h
index 04c9e4d..8eb9c99 100755
--- a/src/mvp_omp.h
+++ b/src/mvp_omp.h
@@ -17,7 +17,6 @@
 
 #if defined(_OPENMP)
 #include <omp.h>
-// [[Rcpp::plugins(openmp)]]
 #else
 #endif