From 55f74dcd22db624ec0ba6bdf024b035f7d616059 Mon Sep 17 00:00:00 2001
From: Shan He <heshan0131@gmail.com>
Date: Sun, 6 Dec 2020 22:04:59 -0800
Subject: [PATCH] [Enhancement] added check for oldLayerData (#1357)

Signed-off-by: Shan He <heshan0131@gmail.com>
---
 src/layers/base-layer.js       | 3 ++-
 src/layers/layer-text-label.js | 7 ++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/layers/base-layer.js b/src/layers/base-layer.js
index c2703831a9..d4530c82b8 100644
--- a/src/layers/base-layer.js
+++ b/src/layers/base-layer.js
@@ -884,7 +884,8 @@ export default class Layer {
     }
 
     let data = [];
-    if (!triggerChanged.getData) {
+
+    if (!triggerChanged.getData && oldLayerData && oldLayerData.data) {
       // same data
       data = oldLayerData.data;
     } else {
diff --git a/src/layers/layer-text-label.js b/src/layers/layer-text-label.js
index 373b143fa1..50433182fd 100644
--- a/src/layers/layer-text-label.js
+++ b/src/layers/layer-text-label.js
@@ -70,7 +70,12 @@ export const formatTextLabelData = ({textLabel, triggerChanged, oldLayerData, da
     const getText = textLabelAccessor(tl);
     let characterSet;
 
-    if (!triggerChanged[`getLabelCharacterSet-${i}`]) {
+    if (
+      !triggerChanged[`getLabelCharacterSet-${i}`] &&
+      oldLayerData &&
+      oldLayerData.textLabels &&
+      oldLayerData.textLabels[i]
+    ) {
       characterSet = oldLayerData.textLabels[i].characterSet;
     } else {
       const allLabels = tl.field ? data.map(getText) : [];