fix(custom): set ignore only if old child exists (apache#17450)

wind108369 · Aug 1, 2022 · 715e1da · 715e1da
1 parent 8e4b5f0
commit 715e1da
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/src/chart/custom/CustomView.ts b/src/chart/custom/CustomView.ts
@@ -1340,6 +1340,13 @@ function mergeChildren(
             );
         }
         else {
+            if (__DEV__) {
+                assert(
+                    oldChild,
+                    'renderItem should not return a group containing elements'
+                    + ' as null/undefined/{} if they do not exist before.'
+                );
+            }
             // If the new element option is null, it means to remove the old
             // element. But we cannot really remove the element from the group
             // directly, because the element order may not be stable when this