diff --git a/session_convert.go b/session_convert.go
index 7f11354d..0c464310 100644
--- a/session_convert.go
+++ b/session_convert.go
@@ -544,6 +544,9 @@ func (session *Session) value2Interface(col *core.Column, fieldValue reflect.Val
 				return 0, err
 			}
 			if col.SQLType.IsBlob() {
+				if data == nil {
+					return nil, nil
+				}
 				return data, nil
 			}
 			return string(data), nil
@@ -556,6 +559,9 @@ func (session *Session) value2Interface(col *core.Column, fieldValue reflect.Val
 			return 0, err
 		}
 		if col.SQLType.IsBlob() {
+			if data == nil {
+				return nil, nil
+			}
 			return data, nil
 		}
 		return string(data), nil
diff --git a/statement.go b/statement.go
index 67e35213..c7ed1834 100644
--- a/statement.go
+++ b/statement.go
@@ -319,7 +319,9 @@ func (statement *Statement) buildUpdates(bean interface{},
 				if err != nil {
 					engine.logger.Error(err)
 				} else {
-					val = data
+					if data != nil {
+						val = data
+					}
 				}
 				goto APPEND
 			}
@@ -330,7 +332,9 @@ func (statement *Statement) buildUpdates(bean interface{},
 			if err != nil {
 				engine.logger.Error(err)
 			} else {
-				val = data
+				if data != nil {
+					val = data
+				}
 			}
 			goto APPEND
 		}