From 8df3133af5dacbb0b477c080c43948fa4b6df932 Mon Sep 17 00:00:00 2001
From: Christopher Arredondo <arredgroup@gmail.com>
Date: Wed, 1 Apr 2026 12:00:00 +0800
Subject: [PATCH] fix: Validate if WebGLRenderingContext exists before
 capturing it (#1777)

* Update webgl.ts

---------

Co-authored-by: Paul D'Ambra <paul.dambra@gmail.com>
Co-authored-by: Justin Halsall <Juice10@users.noreply.github.com>
---
 .changeset/healthy-glasses-shout.md           |  5 +++++
 .../src/record/observers/canvas/webgl.ts      | 22 ++++++++++---------
 2 files changed, 17 insertions(+), 10 deletions(-)
 create mode 100644 .changeset/healthy-glasses-shout.md

diff --git a/.changeset/healthy-glasses-shout.md b/.changeset/healthy-glasses-shout.md
new file mode 100644
index 00000000..43a475d0
--- /dev/null
+++ b/.changeset/healthy-glasses-shout.md
@@ -0,0 +1,5 @@
+---
+"@rrweb/record": patch
+---
+
+Validate if WebGLRenderingContext exists before capturing it
diff --git a/packages/rrweb/src/record/observers/canvas/webgl.ts b/packages/rrweb/src/record/observers/canvas/webgl.ts
index 3c51323b..3a2bb362 100644
--- a/packages/rrweb/src/record/observers/canvas/webgl.ts
+++ b/packages/rrweb/src/record/observers/canvas/webgl.ts
@@ -95,16 +95,18 @@ export default function initCanvasWebGLMutationObserver(
 ): listenerHandler {
   const handlers: listenerHandler[] = [];
 
-  handlers.push(
-    ...patchGLPrototype(
-      win.WebGLRenderingContext.prototype,
-      CanvasContext.WebGL,
-      cb,
-      blockClass,
-      blockSelector,
-      win,
-    ),
-  );
+  if (typeof win.WebGLRenderingContext !== 'undefined') {
+    handlers.push(
+      ...patchGLPrototype(
+        win.WebGLRenderingContext.prototype,
+        CanvasContext.WebGL,
+        cb,
+        blockClass,
+        blockSelector,
+        win,
+      ),
+    );
+  }
 
   if (typeof win.WebGL2RenderingContext !== 'undefined') {
     handlers.push(