diff --git a/dlink-metadata/dlink-metadata-mysql/src/main/java/com/dlink/metadata/convert/MySqlTypeConvert.java b/dlink-metadata/dlink-metadata-mysql/src/main/java/com/dlink/metadata/convert/MySqlTypeConvert.java
index 2020d88381..2b3ef3ec4d 100644
--- a/dlink-metadata/dlink-metadata-mysql/src/main/java/com/dlink/metadata/convert/MySqlTypeConvert.java
+++ b/dlink-metadata/dlink-metadata-mysql/src/main/java/com/dlink/metadata/convert/MySqlTypeConvert.java
@@ -37,7 +37,8 @@ public ColumnType convert(Column column) {
         if (Asserts.isNull(column)) {
             return columnType;
         }
-        String t = column.getType().toLowerCase();
+        Integer length = Asserts.isNull(column.getLength()) ? 0 : column.getLength();
+        String t = Asserts.isNull(column.getType()) ? "" : column.getType().toLowerCase();
         boolean isNullable = !column.isKeyFlag() && column.isNullable();
         if (t.contains("numeric") || t.contains("decimal")) {
             columnType = ColumnType.DECIMAL;
@@ -59,7 +60,7 @@ public ColumnType convert(Column column) {
             } else {
                 columnType = ColumnType.DOUBLE;
             }
-        } else if (t.contains("boolean") || (t.contains("tinyint") && column.getLength() == 1) || t.contains("bit")) {
+        } else if (t.contains("boolean") || (t.contains("tinyint") && length.equals(1)) || t.contains("bit")) {
             if (isNullable) {
                 columnType = ColumnType.JAVA_LANG_BOOLEAN;
             } else {