From d1dc73e14cf089616e9d8ffffb5c3df97ed44229 Mon Sep 17 00:00:00 2001
From: c-bata <contact@c-bata.link>
Date: Mon, 22 Feb 2021 23:08:35 +0900
Subject: [PATCH] Fix a bug that zero objective value is not shown

---
 optuna_dashboard/static/components/StudyDetail.tsx | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/optuna_dashboard/static/components/StudyDetail.tsx b/optuna_dashboard/static/components/StudyDetail.tsx
index 6847be4f..d4633889 100644
--- a/optuna_dashboard/static/components/StudyDetail.tsx
+++ b/optuna_dashboard/static/components/StudyDetail.tsx
@@ -235,7 +235,12 @@ const TrialTable: FC<{ studyDetail: StudyDetail | null }> = ({
         }
         return trials[i].values![0] < trials[j].values![0] ? 1 : -1
       },
-      toCellValue: (i) => trials[i].values?.[0] || null,
+      toCellValue: (i) => {
+        if (trials[i].values === undefined) {
+          return null
+        }
+        return trials[i].values?.[0]
+      },
     })
   } else {
     const objectiveColumns: DataGridColumn<
@@ -258,7 +263,12 @@ const TrialTable: FC<{ studyDetail: StudyDetail | null }> = ({
           ? 1
           : -1
       },
-      toCellValue: (i) => trials[i].values?.[objectiveId] || null,
+      toCellValue: (i) => {
+        if (trials[i].values === undefined) {
+          return null
+        }
+        return trials[i].values?.[objectiveId]
+      },
     }))
     columns.push(...objectiveColumns)
   }