diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/row/Db.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/row/Db.java
index 42466663..96655691 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/row/Db.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/row/Db.java
@@ -39,7 +39,8 @@ public class Db {
 
     public static RowMapperInvoker invoker() {
         if (defaultRowMapperInvoker == null) {
-            SqlSessionFactory sqlSessionFactory = FlexGlobalConfig.getDefaultConfig().getSqlSessionFactory();
+            FlexGlobalConfig defaultConfig = FlexGlobalConfig.getDefaultConfig();
+            SqlSessionFactory sqlSessionFactory = defaultConfig.getSqlSessionFactory();
             defaultRowMapperInvoker = new RowMapperInvoker(sqlSessionFactory);
         }
         return defaultRowMapperInvoker;
diff --git a/mybatis-flex-spring-boot-starter/src/main/java/com/mybatisflex/spring/boot/DbAutoConfiguration.java b/mybatis-flex-spring-boot-starter/src/main/java/com/mybatisflex/spring/boot/DbAutoConfiguration.java
index fa32c576..b8223e3a 100644
--- a/mybatis-flex-spring-boot-starter/src/main/java/com/mybatisflex/spring/boot/DbAutoConfiguration.java
+++ b/mybatis-flex-spring-boot-starter/src/main/java/com/mybatisflex/spring/boot/DbAutoConfiguration.java
@@ -15,18 +15,27 @@
  */
 package com.mybatisflex.spring.boot;
 
+import com.mybatisflex.core.FlexGlobalConfig;
 import com.mybatisflex.core.row.Db;
 import com.mybatisflex.spring.SpringRowSessionManager;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.context.annotation.Configuration;
 
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
 @ConditionalOnClass(Db.class)
 @Configuration(proxyBeanMethods = false)
 @AutoConfigureAfter({MybatisFlexAutoConfiguration.class})
 public class DbAutoConfiguration {
 
     public DbAutoConfiguration() {
-        Db.invoker().setRowSessionManager(new SpringRowSessionManager());
+        FlexGlobalConfig defaultConfig = FlexGlobalConfig.getDefaultConfig();
+        if (defaultConfig == null){
+            Logger.getLogger(Db.class.getName()).log(Level.WARNING,"Cannot get FlexGlobalConfig instance, Perhaps the dataSource config error.");
+        }else {
+            Db.invoker().setRowSessionManager(new SpringRowSessionManager());
+        }
     }
 }