Fix crash when integration is not installed on the space (#3040)

Author: SamyPesse

.changeset/six-camels-joke.md

@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Fix a crash when a page contains a block of an integration that is no longer installed

packages/gitbook/src/components/DocumentView/Integration/IntegrationBlock.tsx

@@ -34,7 +34,11 @@ export async function IntegrationBlock(props: BlockProps<DocumentBlockIntegratio
         dataFetcher.renderIntegrationUi({
             integrationName: block.data.integration,
             request: initialInput,
-        })
+        }),
+
+        // The API can respond with a 400 error if the integration is not installed
+        // and 404 if the integration is not found.
+        [404, 400]
     );
     if (!initialOutput || initialOutput.type === 'complete') {
         return null;