diff --git a/PaginationUtil.cs b/PaginationUtil.cs
index dba4dc5..c44e0ad 100644
--- a/PaginationUtil.cs
+++ b/PaginationUtil.cs
@@ -271,10 +271,16 @@
         public static int CountSql(string layerName, string whereSql)
         {
             string sql = "select count(1) from " + layerName + " where " + whereSql;
-
-            DataTable table = OledbHelper.QueryTable(sql);
-            int result = int.Parse(table.Rows[0].ItemArray[0].ToString());
-            return result;
+            try
+            {
+                DataTable table = OledbHelper.QueryTable(sql);
+                int result = int.Parse(table.Rows[0].ItemArray[0].ToString());
+                return result;
+            }
+            catch
+            {
+                return -1;
+            }
         }
     }
 }