From 8386c2b7fa9a044debb37240baba885c50dd38c2 Mon Sep 17 00:00:00 2001
From: tqchen <tianqi.tchen@gmail.com>
Date: Fri, 13 Mar 2015 23:49:56 -0700
Subject: [PATCH] check r

---
 R-package/src/xgboost_R.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/R-package/src/xgboost_R.cpp b/R-package/src/xgboost_R.cpp
index b887c60ca..315b6c2c1 100644
--- a/R-package/src/xgboost_R.cpp
+++ b/R-package/src/xgboost_R.cpp
@@ -293,7 +293,9 @@ extern "C" {
     const char *raw = XGBoosterGetModelRaw(R_ExternalPtrAddr(handle), &olen);
     _WrapperEnd();
     SEXP ret = PROTECT(allocVector(RAWSXP, olen));
-    memcpy(RAW(ret), raw, olen);
+    if (olen != 0) {
+      memcpy(RAW(ret), raw, olen);
+    }
     UNPROTECT(1);    
     return ret;
   }