diff --git a/.changeset/silly-scissors-bow.md b/.changeset/silly-scissors-bow.md
new file mode 100644
index 00000000000..8a10eadcb4c
--- /dev/null
+++ b/.changeset/silly-scissors-bow.md
@@ -0,0 +1,5 @@
+---
+'@graphiql/toolkit': patch
+---
+
+Subscriptions async iterator completes and better error handling
diff --git a/packages/graphiql-toolkit/package.json b/packages/graphiql-toolkit/package.json
index c230142eea5..0b6f127cb4f 100644
--- a/packages/graphiql-toolkit/package.json
+++ b/packages/graphiql-toolkit/package.json
@@ -20,7 +20,7 @@
   "typings": "dist/index.d.ts",
   "scripts": {},
   "dependencies": {
-    "@n1ru4l/push-pull-async-iterable-iterator": "^2.0.1",
+    "@n1ru4l/push-pull-async-iterable-iterator": "^2.1.4",
     "graphql-ws": "^4.3.2",
     "meros": "^1.1.4"
   },
diff --git a/packages/graphiql-toolkit/src/create-fetcher/lib.ts b/packages/graphiql-toolkit/src/create-fetcher/lib.ts
index e37c79a16f7..3f21b67e5e4 100644
--- a/packages/graphiql-toolkit/src/create-fetcher/lib.ts
+++ b/packages/graphiql-toolkit/src/create-fetcher/lib.ts
@@ -1,4 +1,4 @@
-import { DocumentNode, visit } from 'graphql';
+import { DocumentNode, visit, GraphQLError } from 'graphql';
 import { meros } from 'meros';
 import { createClient, Client, ClientOptions } from 'graphql-ws';
 import { SubscriptionClient } from 'subscriptions-transport-ws';
@@ -94,7 +94,26 @@ export const createWebsocketsFetcherFromClient = (wsClient: Client) => (
   graphQLParams: FetcherParams,
 ) =>
   makeAsyncIterableIteratorFromSink<FetcherResult>(sink =>
-    wsClient!.subscribe(graphQLParams, sink),
+    wsClient!.subscribe(graphQLParams, {
+      ...sink,
+      error: err => {
+        if (err instanceof Error) {
+          sink.error(err);
+        } else if (err instanceof CloseEvent) {
+          sink.error(
+            new Error(
+              `Socket closed with event ${err.code} ${err.reason || ''}`.trim(),
+            ),
+          );
+        } else {
+          sink.error(
+            new Error(
+              (err as GraphQLError[]).map(({ message }) => message).join(', '),
+            ),
+          );
+        }
+      },
+    }),
   );
 
 export const createLegacyWebsocketsFetcher = (
diff --git a/yarn.lock b/yarn.lock
index 8f54a5a01b4..a5262792b87 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2683,10 +2683,10 @@
     call-me-maybe "^1.0.1"
     glob-to-regexp "^0.3.0"
 
-"@n1ru4l/push-pull-async-iterable-iterator@^2.0.1":
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/@n1ru4l/push-pull-async-iterable-iterator/-/push-pull-async-iterable-iterator-2.0.1.tgz#8fc68e0e9e8bd3826d727b96ddd2afba2a7f26c7"
-  integrity sha512-3nDfpI/4WZgdocw75cxG4Qwmi3yp5zOleaT23EpVUhwVwlYzb4kDojl0nCZKB5lCGcTqT5wFlKepShs4Q+hymw==
+"@n1ru4l/push-pull-async-iterable-iterator@^2.1.4":
+  version "2.1.4"
+  resolved "https://registry.yarnpkg.com/@n1ru4l/push-pull-async-iterable-iterator/-/push-pull-async-iterable-iterator-2.1.4.tgz#a90225474352f9f159bff979905f707b9c6bcf04"
+  integrity sha512-qLIvoOUJ+zritv+BlzcBMePKNjKQzH9Rb2i9W98YXxf/M62Lye8qH0peyiU8yJ1tL0kfulWi31BoK10E6BKJeA==
 
 "@nicolo-ribaudo/chokidar-2@2.1.8-no-fsevents":
   version "2.1.8-no-fsevents"