diff --git a/connectors/src/connectors/slack/index.ts b/connectors/src/connectors/slack/index.ts
index 9ab66f5c04d3..5c970518ea0e 100644
--- a/connectors/src/connectors/slack/index.ts
+++ b/connectors/src/connectors/slack/index.ts
@@ -17,7 +17,7 @@ import {
   getSlackClient,
 } from "@connectors/connectors/slack/lib/slack_client";
 import { launchSlackSyncWorkflow } from "@connectors/connectors/slack/temporal/client.js";
-import { ExternalOauthTokenError } from "@connectors/lib/error";
+import { ExternalOauthTokenError, NangoError } from "@connectors/lib/error";
 import { Connector, sequelize_conn } from "@connectors/lib/models";
 import {
   SlackChannel,
@@ -248,9 +248,8 @@ export async function uninstallSlack(nangoConnectionId: string) {
     throw new Error("SLACK_CLIENT_SECRET is not defined");
   }
 
-  const slackAccessToken = await getSlackAccessToken(nangoConnectionId);
-
   try {
+    const slackAccessToken = await getSlackAccessToken(nangoConnectionId);
     const slackClient = await getSlackClient(slackAccessToken);
     await slackClient.auth.test();
     const deleteRes = await slackClient.apps.uninstall({
@@ -265,7 +264,16 @@ export async function uninstallSlack(nangoConnectionId: string) {
       );
     }
   } catch (e) {
-    if (e instanceof ExternalOauthTokenError) {
+    if (e instanceof NangoError && e.type === "unknown_connection") {
+      logger.info(
+        {
+          nangoConnectionId,
+          error: `Nango error: unknown connection: ${e.message}`,
+        },
+        "Unknown nango connection, skipping uninstallation of the Slack app"
+      );
+      return new Ok(undefined);
+    } else if (e instanceof ExternalOauthTokenError) {
       logger.info(
         {
           nangoConnectionId,
diff --git a/connectors/src/lib/error.ts b/connectors/src/lib/error.ts
index 9547d2910bad..b348363014f7 100644
--- a/connectors/src/lib/error.ts
+++ b/connectors/src/lib/error.ts
@@ -63,6 +63,19 @@ export class ExternalOauthTokenError extends Error {
   }
 }
 
+export const NANGO_ERROR_TYPES = ["unknown_connection"];
+export type NangoErrorType = (typeof NANGO_ERROR_TYPES)[number];
+export class NangoError extends Error {
+  readonly type: NangoErrorType;
+
+  constructor(type: NangoErrorType, readonly innerError?: Error) {
+    super(innerError?.message);
+    this.name = "NangoError";
+    this.type = type;
+    this.innerError = innerError;
+  }
+}
+
 export function isNotFoundError(err: unknown): err is NotFoundError {
   return err instanceof HTTPError && err.statusCode === 404;
 }
diff --git a/connectors/src/lib/nango_client.ts b/connectors/src/lib/nango_client.ts
index fbeb5acacda8..a36e9e50009c 100644
--- a/connectors/src/lib/nango_client.ts
+++ b/connectors/src/lib/nango_client.ts
@@ -2,10 +2,13 @@ import { Nango } from "@nangohq/node";
 import axios from "axios";
 
 import type { WorkflowError } from "@connectors/lib/error";
-import { ExternalOauthTokenError } from "@connectors/lib/error";
-
-import type { Result } from "./result";
-import { Err, Ok } from "./result";
+import {
+  ExternalOauthTokenError,
+  NANGO_ERROR_TYPES,
+  NangoError,
+} from "@connectors/lib/error";
+import type { Result } from "@connectors/lib/result";
+import { Err, Ok } from "@connectors/lib/result";
 
 const { NANGO_SECRET_KEY } = process.env;
 
@@ -35,6 +38,10 @@ class CustomNango extends Nango {
             ) {
               throw new ExternalOauthTokenError();
             }
+            const errorType = e.response.data.type;
+            if (NANGO_ERROR_TYPES.includes(errorType)) {
+              throw new NangoError(errorType, e);
+            }
           }
         }
         if (e.status === 520 && e.code === "ERR_BAD_RESPONSE") {