diff --git a/hack/visual_regression_test.py b/hack/visual_regression_test.py
index 77a795c3..e3b54cbc 100644
--- a/hack/visual_regression_test.py
+++ b/hack/visual_regression_test.py
@@ -168,6 +168,29 @@ def create_dummy_storage() -> optuna.storages.InMemoryStorage:
 
     study.optimize(objective_single_inf_report, n_trials=50)
 
+    # Issue 410
+    study = optuna.create_study(study_name="Issue 410", storage=storage, sampler=sampler)
+
+    def objective_issue_410(trial: optuna.Trial) -> float:
+        trial.suggest_categorical("resample_rate", ["50ms"])
+        trial.suggest_categorical("channels", ["all"])
+        trial.suggest_categorical("window_size", [256])
+        if trial.number > 15:
+            raise Exception("Unexpected error")
+        trial.suggest_categorical("cbow", [True])
+        trial.suggest_categorical("model", ["m1"])
+
+        trial.set_user_attr("epochs", 0)
+        trial.set_user_attr("deterministic", True)
+        if trial.number > 10:
+            raise Exception("unexpeccted error")
+        trial.set_user_attr("folder", "/path/to/folder")
+        trial.set_user_attr("resample_type", "foo")
+        trial.set_user_attr("run_id", "0001")
+        return 1.0
+
+    study.optimize(objective_issue_410, n_trials=20, catch=(Exception,))
+
     # No trials single-objective study
     optuna.create_study(study_name="single-no-trials", storage=storage, sampler=sampler)
 
diff --git a/optuna_dashboard/ts/components/GraphContour.tsx b/optuna_dashboard/ts/components/GraphContour.tsx
index 0590540d..fa207cce 100644
--- a/optuna_dashboard/ts/components/GraphContour.tsx
+++ b/optuna_dashboard/ts/components/GraphContour.tsx
@@ -166,6 +166,31 @@ const plotContour = (
   const xIndices = xAxis.indices
   const yIndices = yAxis.indices
 
+  const layout: Partial<plotly.Layout> = {
+    xaxis: {
+      title: xParam.name,
+      type: xAxis.isCat ? "category" : undefined,
+    },
+    yaxis: {
+      title: yParam.name,
+      type: yAxis.isCat ? "category" : undefined,
+    },
+    margin: {
+      l: 50,
+      t: 0,
+      r: 50,
+      b: 50,
+    },
+    uirevision: "true",
+    template: mode === "dark" ? plotlyDarkTemplate : {},
+  }
+
+  // TODO(c-bata): Support parameters that only have the single value
+  if (xIndices.length <= 1 || yIndices.length <= 1) {
+    plotly.react(plotDomId, [], layout)
+    return
+  }
+
   const xValues: plotly.Datum[] = []
   const yValues: plotly.Datum[] = []
   const zValues: plotly.Datum[][] = new Array(yIndices.length)
@@ -214,25 +239,6 @@ const plotContour = (
       showlegend: false,
     },
   ]
-
-  const layout: Partial<plotly.Layout> = {
-    xaxis: {
-      title: xParam.name,
-      type: xAxis.isCat ? "category" : undefined,
-    },
-    yaxis: {
-      title: yParam.name,
-      type: yAxis.isCat ? "category" : undefined,
-    },
-    margin: {
-      l: 50,
-      t: 0,
-      r: 50,
-      b: 50,
-    },
-    uirevision: "true",
-    template: mode === "dark" ? plotlyDarkTemplate : {},
-  }
   plotly.react(plotDomId, plotData, layout)
 }