From 1f549e4a26cb28d2549504ba1294c8137cf81b8f Mon Sep 17 00:00:00 2001
From: Emily Huang <emilyjiajiahuang@gmail.com>
Date: Mon, 27 Mar 2023 11:23:05 -0400
Subject: [PATCH] Return null position instead of using assertNotNull

---
 packages/iris-grid/src/IrisGridRenderer.ts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/packages/iris-grid/src/IrisGridRenderer.ts b/packages/iris-grid/src/IrisGridRenderer.ts
index 0f3b9c31d2..96927440b9 100644
--- a/packages/iris-grid/src/IrisGridRenderer.ts
+++ b/packages/iris-grid/src/IrisGridRenderer.ts
@@ -1005,7 +1005,7 @@ class IrisGridRenderer extends GridRenderer {
     height: number | null;
   } {
     const NULL_POSITION = { left: null, top: null, width: null, height: null };
-    if (mouseX == null || mouseY == null || !metrics) {
+    if (mouseX == null || mouseY == null || metrics == null) {
       return NULL_POSITION;
     }
     const { rowHeight, columnWidth, left, top } = GridUtils.getCellInfoFromXY(
@@ -1014,9 +1014,10 @@ class IrisGridRenderer extends GridRenderer {
       metrics
     );
 
-    assertNotNull(left);
-    assertNotNull(columnWidth);
-    assertNotNull(top);
+    if (left == null || columnWidth == null || top == null) {
+      return NULL_POSITION;
+    }
+
     const { width: gridWidth, verticalBarWidth } = metrics;
     const { cellHorizontalPadding } = theme;