diff --git a/src/entry/Maat_rule.cpp b/src/entry/Maat_rule.cpp
index 6fa88c3..337748e 100644
--- a/src/entry/Maat_rule.cpp
+++ b/src/entry/Maat_rule.cpp
@@ -1947,6 +1947,7 @@ int add_group_to_compile(struct Maat_compile_group_relation*relation, struct Maa
 		relation->not_flag[write_pos]=0;
 	}
 	relation->group_cnt++;
+	a_rule_group->ref_by_parent_cnt++;
 	//member group->compile_shortcut may set to NULL and compile rule pointer repeatly,until rule build finish.
 	if(a_rule_group->ref_by_parent_cnt==1&&relation->group_cnt==1)
 	{
@@ -1956,7 +1957,6 @@ int add_group_to_compile(struct Maat_compile_group_relation*relation, struct Maa
 	{
 		a_rule_group->compile_shortcut=NULL;
 	}
-	a_rule_group->ref_by_parent_cnt++;
 	//update group's shortcut when compile has more than one group.
 	if(relation->group_cnt!=1)
 	{
@@ -1995,6 +1995,12 @@ struct Maat_group_inner* del_group_from_compile(struct Maat_compile_group_relati
 				relation->not_group_cnt--;
 				relation->not_flag[i]=0;
 			}
+			if(group_rule->compile_shortcut)
+			{
+				assert(group_rule->compile_shortcut==relation);
+				assert(group_rule->ref_by_parent_cnt==1&&relation->group_cnt==1);
+				group_rule->compile_shortcut=NULL;
+			}			
 			relation->group_cnt--;
 			break;
 		}
@@ -2499,6 +2505,12 @@ int add_group_rule(struct Maat_table_desc* table, struct db_group_rule_t* db_gro
 		{
 			parent_group=create_group_rule(db_group_rule->parent_id, table->table_id, scanner);
 		}
+		//A sub group is not possile to have a compile shortcut.
+		if(group_rule->compile_shortcut)
+		{
+			assert(group_rule->ref_by_parent_cnt==1);			
+			group_rule->compile_shortcut=NULL;
+		}	
 		group_rule->ref_by_parent_cnt++;
 		parent_group->ref_by_children_cnt++;
 		ret=igraph_get_eid(&scanner->group_graph, &edge_id, group_rule->vertex_id, parent_group->vertex_id, IGRAPH_DIRECTED, /*error*/ 0);
diff --git a/src/inc_internal/Maat_rule_internal.h b/src/inc_internal/Maat_rule_internal.h
index 178e85c..ce6e6a7 100644
--- a/src/inc_internal/Maat_rule_internal.h
+++ b/src/inc_internal/Maat_rule_internal.h
@@ -135,23 +135,6 @@ struct Maat_region_inner
 	int expr_id_ub;
 	enum MAAT_TABLE_TYPE table_type;
 };
-struct Maat_group_inner
-{
-	int group_id;
-	int table_id;
-	int region_boundary;
-	int region_cnt;
-	int ref_by_parent_cnt;
-	int ref_by_children_cnt;
-	char* group_name;
-	int has_compile_neighbors;
-	int vertex_id;
-	int top_group_cnt;
-	long long* top_groups;
-	dynamic_array_t *regions;
-	void* compile_shortcut;
-	pthread_mutex_t mutex;
-};
 #define	COMPILE_RELATION_MAGIC	0x1a2b3c4d
 struct Maat_compile_group_relation
 {
@@ -166,6 +149,25 @@ struct Maat_compile_group_relation
 	pthread_rwlock_t rwlock;//reading compile rule is safe in update thread, rwlock lock called when delete or scan thread read
 
 };
+
+struct Maat_group_inner
+{
+	int group_id;
+	int table_id;
+	int region_boundary;
+	int region_cnt;
+	int ref_by_parent_cnt;
+	int ref_by_children_cnt;
+	char* group_name;
+	int has_compile_neighbors;
+	int vertex_id;
+	int top_group_cnt;
+	long long* top_groups;
+	dynamic_array_t *regions;
+	struct Maat_compile_group_relation* compile_shortcut;
+	pthread_mutex_t mutex;
+};
+
 struct _compile_result_t
 {
 	int compile_id;