diff --git a/optuna_dashboard/ts/action.ts b/optuna_dashboard/ts/action.ts
index e8f2aa35..9f8db581 100644
--- a/optuna_dashboard/ts/action.ts
+++ b/optuna_dashboard/ts/action.ts
@@ -444,17 +444,9 @@ export const actionCreator = () => {
       })
   }
 
-  const tellTrial = (
-    studyId: number,
-    trialId: number,
-    state: TrialStateFinished,
-    values?: number[]
-  ): void => {
-    const message =
-      values === undefined
-        ? `id=${trialId}, state=${state}`
-        : `id=${trialId}, state=${state}, values=${values}`
-    tellTrialAPI(trialId, state, values)
+  const makeTrialFail = (studyId: number, trialId: number): void => {
+    const message = `id=${trialId}, state=Fail`
+    tellTrialAPI(trialId, "Fail")
       .then(() => {
         const index = studyDetails[studyId].trials.findIndex(
           (t) => t.trial_id === trialId
@@ -465,7 +457,41 @@ export const actionCreator = () => {
           })
           return
         }
-        setTrialStateValues(studyId, index, state, values)
+        setTrialStateValues(studyId, index, "Fail")
+        enqueueSnackbar(`Successfully updated trial (${message})`, {
+          variant: "success",
+        })
+      })
+      .catch((err) => {
+        const reason = err.response?.data.reason
+        enqueueSnackbar(
+          `Failed to update trial (${message}). Reason: ${reason}`,
+          {
+            variant: "error",
+          }
+        )
+        console.log(err)
+      })
+  }
+
+  const makeTrialComplete = (
+    studyId: number,
+    trialId: number,
+    values: number[]
+  ): void => {
+    const message = `id=${trialId}, state=Complete, values=${values}`
+    tellTrialAPI(trialId, "Complete", values)
+      .then(() => {
+        const index = studyDetails[studyId].trials.findIndex(
+          (t) => t.trial_id === trialId
+        )
+        if (index === -1) {
+          enqueueSnackbar(`Unexpected error happens. Please reload the page.`, {
+            variant: "error",
+          })
+          return
+        }
+        setTrialStateValues(studyId, index, "Complete", values)
         enqueueSnackbar(`Successfully updated trial (${message})`, {
           variant: "success",
         })
@@ -498,7 +524,8 @@ export const actionCreator = () => {
     saveTrialNote,
     uploadArtifact,
     deleteArtifact,
-    tellTrial,
+    makeTrialComplete,
+    makeTrialFail,
   }
 }
 
diff --git a/optuna_dashboard/ts/components/ObjectiveForm.tsx b/optuna_dashboard/ts/components/ObjectiveForm.tsx
index ae8b2ae8..0e61ce09 100644
--- a/optuna_dashboard/ts/components/ObjectiveForm.tsx
+++ b/optuna_dashboard/ts/components/ObjectiveForm.tsx
@@ -69,7 +69,7 @@ export const ObjectiveForm: FC<{
     if (filtered.length !== directions.length) {
       return
     }
-    action.tellTrial(trial.study_id, trial.trial_id, "Complete", filtered)
+    action.makeTrialComplete(trial.study_id, trial.trial_id, filtered)
   }
 
   const getObjectiveName = (i: number): string => {
@@ -264,7 +264,7 @@ export const ObjectiveForm: FC<{
               variant="outlined"
               color="error"
               onClick={() => {
-                action.tellTrial(trial.study_id, trial.trial_id, "Fail")
+                action.makeTrialFail(trial.study_id, trial.trial_id)
               }}
             >
               Fail Trial
diff --git a/optuna_dashboard/ts/components/TrialTable.tsx b/optuna_dashboard/ts/components/TrialTable.tsx
index 3ea8e14a..32206e8a 100644
--- a/optuna_dashboard/ts/components/TrialTable.tsx
+++ b/optuna_dashboard/ts/components/TrialTable.tsx
@@ -295,7 +295,7 @@ export const TrialTable: FC<{
         return
       }
 
-      action.tellTrial(studyId, trialId, "Complete", objectiveValues)
+      action.makeTrialComplete(studyId, trialId, objectiveValues)
     }
 
     const handleFailTrial = (e: MouseEvent<HTMLButtonElement>): void => {
@@ -304,7 +304,7 @@ export const TrialTable: FC<{
       }
       const studyId = studyDetail.id
       const trialId = trials[index].trial_id
-      action.tellTrial(studyId, trialId, "Fail")
+      action.makeTrialFail(studyId, trialId)
     }
 
     return (