diff --git a/dbswitch-common/src/main/java/org/dromara/dbswitch/common/util/ObjectCastUtils.java b/dbswitch-common/src/main/java/org/dromara/dbswitch/common/util/ObjectCastUtils.java
index 2e402c0e27930f36a41bd832e9be22eb8004cc4b..284ea76bac36ca5053ce3185b5c2464131f70365 100644
--- a/dbswitch-common/src/main/java/org/dromara/dbswitch/common/util/ObjectCastUtils.java
+++ b/dbswitch-common/src/main/java/org/dromara/dbswitch/common/util/ObjectCastUtils.java
@@ -81,7 +81,8 @@ public final class ObjectCastUtils {
     } else if (in instanceof java.lang.String || in instanceof java.lang.Character) {
       return in.toString().getBytes();
     } else if (in instanceof java.sql.Clob) {
-      return clob2Str((java.sql.Clob) in).getBytes();
+      String str = clob2Str((java.sql.Clob) in);
+      return null == str ? null : str.getBytes();
     } else {
       try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
           ObjectOutputStream oos = new ObjectOutputStream(bos)) {
@@ -865,8 +866,6 @@ public final class ObjectCastUtils {
       return in.toString();
     } else if (in instanceof java.lang.String) {
       return in.toString();
-    } else if (in instanceof java.lang.Character) {
-      return in.toString();
     } else if (in instanceof java.sql.Clob) {
       return clob2Str((java.sql.Clob) in);
     } else if (in instanceof java.sql.Blob) {