diff --git a/library/src/com/orm/SugarRecord.java b/library/src/com/orm/SugarRecord.java
index 764b655e..f87630b4 100644
--- a/library/src/com/orm/SugarRecord.java
+++ b/library/src/com/orm/SugarRecord.java
@@ -113,7 +113,11 @@ long save(SQLiteDatabase db) {
                             values.put(columnName, (Long) null);
                         }
                     } else {
-                        values.put(columnName, String.valueOf(columnValue));
+                        if (columnValue == null) {
+                            values.putNull(columnName);
+                        } else {
+                            values.put(columnName, String.valueOf(columnValue));
+                        }
                     }
                 }