diff --git a/Documentation~/zh/changelog.md b/Documentation~/zh/changelog.md
index 7a014141..f54e0784 100644
--- a/Documentation~/zh/changelog.md
+++ b/Documentation~/zh/changelog.md
@@ -68,6 +68,7 @@ slug: /changelog
 
 ## master
 
+* (2023.09.16) 修复`Tooltip`在类目轴无数据时异常报错的问题 (#279)
 * (2023.09.16) 修复`Pie`无数据时绘制异常的问题
 * (2023.09.12) 增加`Pie`的`radiusGradient`可设置半径方向的渐变效果
 * (2023.09.05) 优化`LabelLine`的`lineEndX`在`Pie`中的表现
diff --git a/Runtime/Component/Axis/AxisHandler.cs b/Runtime/Component/Axis/AxisHandler.cs
index 4651da8a..21cb690e 100644
--- a/Runtime/Component/Axis/AxisHandler.cs
+++ b/Runtime/Component/Axis/AxisHandler.cs
@@ -38,7 +38,7 @@ namespace XCharts
                 return;
             if (!grid.context.isPointerEnter)
             {
-                axis.context.pointerValue = double.NaN;
+                axis.context.pointerValue = double.PositiveInfinity;
             }
             else
             {
diff --git a/Runtime/Component/Axis/RadiusAxis/RadiusAxisHandler.cs b/Runtime/Component/Axis/RadiusAxis/RadiusAxisHandler.cs
index a72e17c5..970ecfeb 100644
--- a/Runtime/Component/Axis/RadiusAxis/RadiusAxisHandler.cs
+++ b/Runtime/Component/Axis/RadiusAxis/RadiusAxisHandler.cs
@@ -34,7 +34,7 @@ namespace XCharts.Runtime
 
             if (!polar.context.isPointerEnter)
             {
-                axis.context.pointerValue = double.NaN;
+                axis.context.pointerValue = double.PositiveInfinity;
                 return;
             }