diff --git a/backend/middlewares/flow/src/api/cc/flow_cc_inst_api.rs b/backend/middlewares/flow/src/api/cc/flow_cc_inst_api.rs
index 43cc59b1d..7f361d06f 100644
--- a/backend/middlewares/flow/src/api/cc/flow_cc_inst_api.rs
+++ b/backend/middlewares/flow/src/api/cc/flow_cc_inst_api.rs
@@ -153,11 +153,8 @@ impl FlowCcInstApi {
         ctx: TardisContextExtractor,
         _request: &Request,
     ) -> TardisApiResult<Void> {
-        let mut funs = flow_constants::get_tardis_inst();
-        funs.begin().await?;
         let vars = HashMap::from([("current_assigned".to_string(), Value::String(modify_req.0.current_assigned))]);
-        FlowInstServ::modify_current_vars(&flow_inst_id.0, &vars, &funs, &ctx.0).await?;
-        funs.commit().await?;
+        FlowInstServ::modify_current_vars(&flow_inst_id.0, &vars, &ctx.0).await?;
         TardisResp::ok(Void {})
     }
 
@@ -172,9 +169,7 @@ impl FlowCcInstApi {
         _request: &Request,
     ) -> TardisApiResult<Void> {
         let mut funs = flow_constants::get_tardis_inst();
-        funs.begin().await?;
-        FlowInstServ::modify_current_vars(&flow_inst_id.0, &modify_req.0.vars, &funs, &ctx.0).await?;
-        funs.commit().await?;
+        FlowInstServ::modify_current_vars(&flow_inst_id.0, &modify_req.0.vars, &ctx.0).await?;
         TardisResp::ok(Void {})
     }
 }
diff --git a/backend/middlewares/flow/src/api/ci/flow_ci_inst_api.rs b/backend/middlewares/flow/src/api/ci/flow_ci_inst_api.rs
index 93cfac9d8..a0306a4ec 100644
--- a/backend/middlewares/flow/src/api/ci/flow_ci_inst_api.rs
+++ b/backend/middlewares/flow/src/api/ci/flow_ci_inst_api.rs
@@ -122,12 +122,10 @@ impl FlowCiInstApi {
         mut ctx: TardisContextExtractor,
         request: &Request,
     ) -> TardisApiResult<Void> {
-        let mut funs = flow_constants::get_tardis_inst();
+        let funs = flow_constants::get_tardis_inst();
         check_without_owner_and_unsafe_fill_ctx(request, &funs, &mut ctx.0)?;
-        funs.begin().await?;
         let vars = HashMap::from([("assigned_to".to_string(), Value::String(modify_req.0.current_assigned))]);
-        FlowInstServ::modify_current_vars(&flow_inst_id.0, &vars, &funs, &ctx.0).await?;
-        funs.commit().await?;
+        FlowInstServ::modify_current_vars(&flow_inst_id.0, &vars, &ctx.0).await?;
         TardisResp::ok(Void {})
     }
 
@@ -140,11 +138,9 @@ impl FlowCiInstApi {
         mut ctx: TardisContextExtractor,
         request: &Request,
     ) -> TardisApiResult<Void> {
-        let mut funs = flow_constants::get_tardis_inst();
+        let funs = flow_constants::get_tardis_inst();
         check_without_owner_and_unsafe_fill_ctx(request, &funs, &mut ctx.0)?;
-        funs.begin().await?;
         FlowInstServ::modify_current_vars(&flow_inst_id.0, &modify_req.0.vars, &funs, &ctx.0).await?;
-        funs.commit().await?;
         TardisResp::ok(Void {})
     }
 
diff --git a/backend/middlewares/flow/src/serv/flow_inst_serv.rs b/backend/middlewares/flow/src/serv/flow_inst_serv.rs
index da09c5acb..e671a17ef 100644
--- a/backend/middlewares/flow/src/serv/flow_inst_serv.rs
+++ b/backend/middlewares/flow/src/serv/flow_inst_serv.rs
@@ -1103,7 +1103,9 @@ impl FlowInstServ {
         }
     }
 
-    pub async fn modify_current_vars(flow_inst_id: &str, current_vars: &HashMap<String, Value>, funs: &TardisFunsInst, ctx: &TardisContext) -> TardisResult<()> {
+    pub async fn modify_current_vars(flow_inst_id: &str, current_vars: &HashMap<String, Value>, ctx: &TardisContext) -> TardisResult<()> {
+        let mut funs = flow_constants::get_tardis_inst();
+        funs.begin().await?;
         let flow_inst_detail = Self::get(flow_inst_id, funs, ctx).await?;
         let mut new_vars: HashMap<String, Value> = HashMap::new();
         if let Some(old_current_vars) = &flow_inst_detail.current_vars {
@@ -1116,7 +1118,9 @@ impl FlowInstServ {
             ..Default::default()
         };
         funs.db().update_one(flow_inst, ctx).await.unwrap();
+        funs.commit().await?;
 
+        let funs = flow_constants::get_tardis_inst();
         if let Some(ws_client) = ws_flow_client().await {
             ws_client
                 .publish_front_change(
@@ -1127,7 +1131,7 @@ impl FlowInstServ {
                 )
                 .await?;
         } else {
-            FlowEventServ::do_front_change(flow_inst_id, ctx, funs).await?;
+            FlowEventServ::do_front_change(flow_inst_id, ctx, &funs).await?;
         }
 
         Ok(())
@@ -1214,7 +1218,6 @@ impl FlowInstServ {
                 Self::modify_current_vars(
                     &flow_inst.id,
                     &TardisFuns::json.json_to_obj::<HashMap<String, Value>>(new_vars).unwrap_or_default(),
-                    funs,
                     &ctx,
                 )
                 .await?;
@@ -1228,7 +1231,7 @@ impl FlowInstServ {
         let mut current_vars = Self::get(inst_id, funs, ctx).await?.current_vars;
         if current_vars.is_none() || !current_vars.clone().unwrap_or_default().contains_key(key) {
             let new_vars = Self::get_new_vars(inst_id, funs, ctx).await?;
-            Self::modify_current_vars(inst_id, &TardisFuns::json.json_to_obj::<HashMap<String, Value>>(new_vars).unwrap_or_default(), funs, ctx).await?;
+            Self::modify_current_vars(inst_id, &TardisFuns::json.json_to_obj::<HashMap<String, Value>>(new_vars).unwrap_or_default(), ctx).await?;
             current_vars = Self::get(inst_id, funs, ctx).await?.current_vars;
         }