diff --git a/hcloud/_client.py b/hcloud/_client.py
index 1da0645..a0de13a 100644
--- a/hcloud/_client.py
+++ b/hcloud/_client.py
@@ -247,7 +247,7 @@ def request(  # type: ignore[no-untyped-def]
             raise APIException(
                 code=error["code"],
                 message=error["message"],
-                details=error["details"],
+                details=error.get("details"),
                 correlation_id=correlation_id,
             )
 
diff --git a/tests/unit/test_client.py b/tests/unit/test_client.py
index 7d8b5f9..e258a51 100644
--- a/tests/unit/test_client.py
+++ b/tests/unit/test_client.py
@@ -110,7 +110,6 @@ def test_request_fails_correlation_id(self, client, response):
                 "error": {
                     "code": "conflict",
                     "message": "some conflict",
-                    "details": None,
                 }
             }
         ).encode("utf-8")