From af9970f0cb7eacefdb4430979d7d8ddc7ea206d6 Mon Sep 17 00:00:00 2001
From: Evan Owen <kainosnoema@gmail.com>
Date: Fri, 13 Jan 2023 13:40:26 -0800
Subject: [PATCH] Guard against no support for AbortController

Signed-off-by: Evan Owen <kainosnoema@gmail.com>
---
 src/timeoutLink.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/timeoutLink.ts b/src/timeoutLink.ts
index c4e01f4..52d9723 100644
--- a/src/timeoutLink.ts
+++ b/src/timeoutLink.ts
@@ -96,9 +96,11 @@ export default class TimeoutLink extends ApolloLink {
       };
 
       // cancel timeout if aborted from somewhere else
-      controller.signal.addEventListener("abort", () => {
-        cancelTimeout();
-      });
+      if (controller) {
+        controller.signal.addEventListener("abort", () => {
+          cancelTimeout();
+        });
+      }
 
       let ctxRef = operation.getContext().timeoutRef;
       if (ctxRef) {