From a8ceb5b5e5f4bcc3085041acda1531b0ae8923fe Mon Sep 17 00:00:00 2001
From: Ovilia <zwl.sjtu@gmail.com>
Date: Tue, 4 Jul 2023 17:26:58 +0800
Subject: [PATCH 1/3] fix(endLabel): endLabel fail with null data #18839

---
 src/chart/line/LineView.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/chart/line/LineView.ts b/src/chart/line/LineView.ts
index d16e341a72..8c07a3d93d 100644
--- a/src/chart/line/LineView.ts
+++ b/src/chart/line/LineView.ts
@@ -1299,7 +1299,10 @@ class LineView extends ChartView {
                 });
             }
             if (valueAnimation) {
-                labelInner(endLabel).setLabelText(value);
+                const inner = labelInner(endLabel);
+                if (inner && typeof inner.setLabelText === 'function') {
+                    inner.setLabelText(value);
+                }
             }
         }
     }

From ca3718af8b25eee8b53dfef0a36f5028b9b3c60c Mon Sep 17 00:00:00 2001
From: Ovilia <zwl.sjtu@gmail.com>
Date: Tue, 4 Jul 2023 17:31:23 +0800
Subject: [PATCH 2/3] test(endLabel): add test case

---
 test/line-endLabel.html | 44 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/test/line-endLabel.html b/test/line-endLabel.html
index 860fec0841..a0d5db2098 100644
--- a/test/line-endLabel.html
+++ b/test/line-endLabel.html
@@ -36,7 +36,7 @@
                 height: 1000px;
                 margin-bottom: 30px;
             }
-            #main2, #main3 {
+            #main2, #main3, #main4 {
                 width: 100%;
                 height: 300px;
                 margin-bottom: 30px;
@@ -129,6 +129,7 @@
         <div id="main1"></div>
         <div id="main2"></div>
         <div id="main3"></div>
+        <div id="main4"></div>
 
         <script>
 
@@ -433,5 +434,46 @@
             })
 
         </script>
+
+        <script>
+
+
+            require([
+                'echarts'
+            ], function (echarts) {
+
+                var chart = echarts.init(document.getElementById('main4'));
+                var option = {
+                    title: [{
+                        text: 'endLabel should not fail with null data',
+                        textAlign: 'center',
+                        left: '50%',
+                        top: 0
+                    }],
+                    xAxis: [{
+                        data: ['a', 'b']
+                    }],
+                    yAxis: [{
+                    }],
+                    series: [{
+                        type: 'line',
+                        data: [1, 2],
+                        endLabel: {
+                            show: true
+                        }
+                    }, {
+                        type: 'line',
+                        data: [null, '-'],
+                        endLabel: {
+                            show: true
+                        }
+                    }],
+                    animationDuration: 5000
+                };
+                chart.setOption(option);
+
+            })
+
+        </script>
     </body>
 </html>

From dd53fc9f18fa29f04f8d85cb46791ea9f0936a27 Mon Sep 17 00:00:00 2001
From: Ovilia <zwl.sjtu@gmail.com>
Date: Wed, 5 Jul 2023 09:51:51 +0800
Subject: [PATCH 3/3] fix(endLabel): remove check of inner

---
 src/chart/line/LineView.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/chart/line/LineView.ts b/src/chart/line/LineView.ts
index 8c07a3d93d..435fa2a90c 100644
--- a/src/chart/line/LineView.ts
+++ b/src/chart/line/LineView.ts
@@ -1300,7 +1300,7 @@ class LineView extends ChartView {
             }
             if (valueAnimation) {
                 const inner = labelInner(endLabel);
-                if (inner && typeof inner.setLabelText === 'function') {
+                if (typeof inner.setLabelText === 'function') {
                     inner.setLabelText(value);
                 }
             }