diff --git a/chat2db-server/chat2db-plugins/chat2db-mysql/src/main/java/ai/chat2db/plugin/mysql/builder/MysqlSqlBuilder.java b/chat2db-server/chat2db-plugins/chat2db-mysql/src/main/java/ai/chat2db/plugin/mysql/builder/MysqlSqlBuilder.java
index 4d126de9..aa404f46 100644
--- a/chat2db-server/chat2db-plugins/chat2db-mysql/src/main/java/ai/chat2db/plugin/mysql/builder/MysqlSqlBuilder.java
+++ b/chat2db-server/chat2db-plugins/chat2db-mysql/src/main/java/ai/chat2db/plugin/mysql/builder/MysqlSqlBuilder.java
@@ -95,9 +95,10 @@ public class MysqlSqlBuilder implements SqlBuilder {
                 script.append("\t").append(mysqlIndexTypeEnum.buildModifyIndex(tableIndex)).append(",\n");
             }
         }
-
-        script = new StringBuilder(script.substring(0, script.length() - 2));
-        script.append(";");
+        if(script.length()>2) {
+            script = new StringBuilder(script.substring(0, script.length() - 2));
+            script.append(";");
+        }
 
         return script.toString();
     }
diff --git a/chat2db-server/chat2db-plugins/chat2db-oracle/src/main/java/ai/chat2db/plugin/oracle/builder/OracleSqlBuilder.java b/chat2db-server/chat2db-plugins/chat2db-oracle/src/main/java/ai/chat2db/plugin/oracle/builder/OracleSqlBuilder.java
index 1a7eb589..93e691d9 100644
--- a/chat2db-server/chat2db-plugins/chat2db-oracle/src/main/java/ai/chat2db/plugin/oracle/builder/OracleSqlBuilder.java
+++ b/chat2db-server/chat2db-plugins/chat2db-oracle/src/main/java/ai/chat2db/plugin/oracle/builder/OracleSqlBuilder.java
@@ -92,9 +92,10 @@ public class OracleSqlBuilder implements SqlBuilder {
                 script.append("\t").append(mysqlIndexTypeEnum.buildModifyIndex(tableIndex)).append(";\n");
             }
         }
-
-        script = new StringBuilder(script.substring(0, script.length() - 2));
-        script.append(";");
+        if(script.length()>2) {
+            script = new StringBuilder(script.substring(0, script.length() - 2));
+            script.append(";");
+        }
 
         return script.toString();
     }