diff --git a/modules/i3plus-pojo-base/src/main/java/cn/estsh/i3plus/pojo/base/enumutil/CommonEnumUtil.java b/modules/i3plus-pojo-base/src/main/java/cn/estsh/i3plus/pojo/base/enumutil/CommonEnumUtil.java
index 91912ab..1dba3c4 100644
--- a/modules/i3plus-pojo-base/src/main/java/cn/estsh/i3plus/pojo/base/enumutil/CommonEnumUtil.java
+++ b/modules/i3plus-pojo-base/src/main/java/cn/estsh/i3plus/pojo/base/enumutil/CommonEnumUtil.java
@@ -2558,4 +2558,52 @@ public class CommonEnumUtil {
     public enum DYNAMIC_DATA_SOURCE_TYPE {
         MASTER,NODE
     }
+
+    /**
+     * 会话模式
+     */
+    @JsonFormat(shape = JsonFormat.Shape.OBJECT)
+    public enum SESSION_MODE {
+        DEFAULT(10, "默认"),
+        OVERWRITE(20, "覆盖"),
+        SEIZE(30, "抢占");
+
+        private int value;
+        private String description;
+
+        SESSION_MODE(int value, String description) {
+            this.value = value;
+            this.description = description;
+        }
+
+        public int getValue() {
+            return value;
+        }
+
+        public String getDescription() {
+            return description;
+        }
+
+        public static String valueOf(int val) {
+            String tmp = null;
+            for (int i = 0; i < values().length; i++) {
+                if (values()[i].value == val) {
+                    tmp = values()[i].description;
+                }
+            }
+            return tmp;
+        }
+
+
+        public static Integer descriptionOfValue(String desc) {
+            Integer tmp = null;
+            for (int i = 0; i < values().length; i++) {
+                if (values()[i].description.equals(desc)) {
+                    tmp = values()[i].value;
+                }
+            }
+            return tmp;
+        }
+    }
+
 }
diff --git a/modules/i3plus-pojo-base/src/main/java/cn/estsh/i3plus/pojo/base/jpa/daoimpl/BaseRepositoryImpl.java b/modules/i3plus-pojo-base/src/main/java/cn/estsh/i3plus/pojo/base/jpa/daoimpl/BaseRepositoryImpl.java
index afd81eb..3b2f5a2 100644
--- a/modules/i3plus-pojo-base/src/main/java/cn/estsh/i3plus/pojo/base/jpa/daoimpl/BaseRepositoryImpl.java
+++ b/modules/i3plus-pojo-base/src/main/java/cn/estsh/i3plus/pojo/base/jpa/daoimpl/BaseRepositoryImpl.java
@@ -61,6 +61,9 @@ public class BaseRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRep
     }
 
     public void detachObject(T t){
+        if (t == null) {
+            return;
+        }
         entityManager.detach(t);
     }