diff --git a/tests/test_queue_client.py b/tests/test_queue_client.py
index 429f39f..d591406 100644
--- a/tests/test_queue_client.py
+++ b/tests/test_queue_client.py
@@ -1,3 +1,4 @@
+import json
 from collections import OrderedDict
 from contextlib import aclosing
 
@@ -6,8 +7,13 @@ import pytest
 import twscrape.queue_client as queue_client_module
 from twscrape.account import Account
 from twscrape.accounts_pool import AccountsPool
-from twscrape.http import ConnectError, NetworkError
-from twscrape.queue_client import GqlFeaturesOutdatedError, QueueClient, XClIdGenStore
+from twscrape.http import ConnectError, HttpMethod, NetworkError, Response
+from twscrape.queue_client import (
+    GqlFeaturesOutdatedError,
+    QueueClient,
+    ReqParams,
+    XClIdGenStore,
+)
 from twscrape.utils import utc
 from twscrape.xclid import XClIdAccountError, XClIdGen, XClIdParseError
 
@@ -552,6 +558,86 @@ async def test_gql_features_outdated_raises(client_fixture: CF):
     assert await get_locked(pool) == set()
 
 
+async def test_gql_features_self_healed_and_retried(client_fixture: CF, monkeypatch):
+    pool, client, mock = client_fixture
+    await client.__aenter__()
+
+    sent: list[dict] = []
+    original = mock.request
+
+    async def spy(method: HttpMethod, url: str, **kwargs) -> Response:
+        sent.append(dict(kwargs.get("params") or {}))
+        return await original(method, url, **kwargs)
+
+    monkeypatch.setattr(mock, "request", spy)
+
+    mock.add_response(
+        json={
+            "errors": [{"code": 336, "message": "The following features cannot be null: foo, bar"}]
+        }
+    )
+    mock.add_response(json={"data": {"user": {"id": 1}}})
+
+    params: ReqParams = {"variables": "{}", "features": json.dumps({"baz": True})}
+    rep = await client.get(URL, params=params)
+    assert rep is not None
+
+    # the flags X named were added and the request replayed
+    assert len(sent) == 2
+    assert json.loads(sent[0]["features"]) == {"baz": True}
+    assert json.loads(sent[1]["features"]) == {"baz": True, "foo": True, "bar": True}
+
+    await client.__aexit__(None, None, None)
+
+    # the account must survive: not deactivated, not left locked
+    assert await get_inactive(pool) == set()
+    assert await get_locked(pool) == set()
+
+
+async def test_gql_features_self_heal_persists_across_requests(client_fixture: CF, monkeypatch):
+    _pool, client, mock = client_fixture
+    await client.__aenter__()
+
+    sent = []
+    original = mock.request
+
+    async def spy(method: HttpMethod, url: str, **kwargs) -> Response:
+        sent.append(json.loads(kwargs["params"]["features"]))
+        return await original(method, url, **kwargs)
+
+    monkeypatch.setattr(mock, "request", spy)
+
+    mock.add_response(
+        json={"errors": [{"code": 336, "message": "The following features cannot be null: foo"}]}
+    )
+    mock.add_response(json={"data": {"user": {"id": 1}}})
+    mock.add_response(json={"data": {"user": {"id": 1}}})
+
+    assert await client.get(URL, params={"variables": "{}", "features": "{}"}) is not None
+    assert await client.get(URL, params={"variables": "{}", "features": "{}"}) is not None
+    assert sent == [{}, {"foo": True}, {"foo": True}]
+
+    await client.__aexit__(None, None, None)
+
+
+async def test_gql_features_self_heal_retries_only_once(client_fixture: CF):
+    _pool, client, mock = client_fixture
+    await client.__aenter__()
+
+    # X keeps rejecting even with the flags set — give up rather than loop
+    for _ in range(2):
+        mock.add_response(
+            json={
+                "errors": [{"code": 336, "message": "The following features cannot be null: foo"}]
+            }
+        )
+
+    with pytest.raises(GqlFeaturesOutdatedError):
+        await client.get(URL, params={"variables": "{}", "features": "{}"})
+
+    await client.__aexit__(None, None, None)
+
+
 async def test_gql_features_outdated_raises_when_not_first(client_fixture: CF):
     _pool, client, mock = client_fixture
     await client.__aenter__()
diff --git a/twscrape/queue_client.py b/twscrape/queue_client.py
index 79f30d1..08a5870 100644
--- a/twscrape/queue_client.py
+++ b/twscrape/queue_client.py
@@ -1,6 +1,7 @@
 import asyncio
 import json
 import os
+import re
 from enum import Enum, auto
 from typing import Any
 from urllib.parse import urlparse
@@ -22,6 +23,7 @@ from .utils import utc
 from .xclid import XClIdAccountError, XClIdGen, XClIdParseError
 
 ReqParams = dict[str, str | int] | None
+MISSING_FEATURES_RE = re.compile(r"The following features cannot be null: ([^;]+)")
 TMP_TS = utc.now().isoformat().split(".")[0].replace("T", "_").replace(":", "-")[0:16]
 
 
@@ -32,7 +34,7 @@ class AbortReqError(Exception): ...
 
 
 class GqlFeaturesOutdatedError(AbortReqError):
-    """GQL_FEATURES in api.py no longer matches the X API. Retrying cannot help."""
+    """GQL_FEATURES in api.py no longer matches the X API and self-healing did not resolve it."""
 
 
 class FailKind(Enum):
@@ -134,6 +136,35 @@ def has_error(errors: list[str], prefix: str) -> bool:
     return any(error.startswith(prefix) for error in errors)
 
 
+def parse_missing_features(msg: str) -> list[str]:
+    """Feature flags X named in a (336) error: "...cannot be null: a, b"."""
+    match = MISSING_FEATURES_RE.search(msg)
+    return [x.strip() for x in match.group(1).split(",") if x.strip()] if match else []
+
+
+def add_missing_features(params: ReqParams, missing: list[str]) -> bool:
+    """Set `missing` to true in params["features"]. False if there is nothing to patch."""
+    if not isinstance(params, dict) or "features" not in params:
+        return False
+
+    features = params["features"]
+    if isinstance(features, str):  # encode_params() has already run
+        try:
+            features = json.loads(features)
+        except json.JSONDecodeError:
+            return False
+
+    if not isinstance(features, dict):
+        return False
+
+    if all(features.get(x) is True for x in missing):
+        return False  # already true, so a retry would just loop
+
+    features.update(dict.fromkeys(missing, True))
+    params["features"] = json.dumps(features, separators=(",", ":"))
+    return True
+
+
 def dump_rep(rep: Response):
     count = getattr(dump_rep, "__count", -1) + 1
     setattr(dump_rep, "__count", count)
@@ -168,6 +199,7 @@ class QueueClient:
         self.debug = debug
         self.ctx: Ctx | None = None
         self.proxy = proxy
+        self._healed_features: set[str] = set()
 
     async def __aenter__(self):
         await self._get_ctx()
@@ -312,6 +344,9 @@ class QueueClient:
         return await self.req("GET", url, params=params)
 
     async def req(self, method: HttpMethod, url: str, params: ReqParams = None) -> Response | None:
+        if self._healed_features:
+            add_missing_features(params, list(self._healed_features))
+        features_retried = False
         while True:
             # 1. same ctx until _close_ctx() clears it — that's retry vs rotate
             # 2. no aclose() needed here, __aexit__ handles it
@@ -343,9 +378,21 @@ class QueueClient:
 
                 ctx.req_count += 1  # count only successful
                 return rep
-            except GqlFeaturesOutdatedError:
-                # structurally invalid request, retrying cannot help — let the caller see it
-                raise
+            except GqlFeaturesOutdatedError as e:
+                # X names the flags it wants, so set them and retry once. GQL_FEATURES still
+                # needs a permanent update — the warning says so — but a stale dict shouldn't
+                # take every caller down until the next release.
+                missing = parse_missing_features(str(e))
+                if features_retried or not add_missing_features(params, missing):
+                    raise
+
+                self._healed_features.update(missing)
+                features_retried = True
+                logger.warning(
+                    f"{self.queue}: GQL_FEATURES missing {missing}, set true and retrying. "
+                    "Update GQL_FEATURES in api.py to fix this permanently."
+                )
+                continue
             except AbortReqError:
                 # abort all queries
                 return