diff --git a/lib/io/dsv_io.cpp b/lib/io/dsv_io.cpp
index 18466d1..cbdb8b7 100644
--- a/lib/io/dsv_io.cpp
+++ b/lib/io/dsv_io.cpp
@@ -313,11 +313,6 @@ int gctl::dsv_io::name_index(std::string name, bool iter_row)
 {
     if (iter_row)
     {
-        if (thead_ != RowHead && thead_ != BothHead)
-		{
-			throw std::runtime_error("[gctl::dsv_io] The table is initialized with no row names.");
-		}
-
         for (size_t i = 0; i < row_num_; i++)
 		{
 			if (table_[i][0].str_ == name) return i;
@@ -327,11 +322,6 @@ int gctl::dsv_io::name_index(std::string name, bool iter_row)
     }
     else
     {
-        if (thead_ != ColumnHead && thead_ != BothHead)
-		{
-			throw std::runtime_error("[gctl::dsv_io] The table is initialized with no column names.");
-		}
-
         for (size_t i = 0; i < col_num_; i++)
 		{
             if (table_[0][i].str_ == name) return i;