diff --git a/radicale/app/__init__.py b/radicale/app/__init__.py
index 1303dc9f..0a93dc2c 100644
--- a/radicale/app/__init__.py
+++ b/radicale/app/__init__.py
@@ -36,6 +36,7 @@ import pprint
 import pstats
 import random
 import time
+import traceback
 import zlib
 from http import client
 from typing import Iterable, List, Mapping, Tuple, Union
@@ -574,6 +575,10 @@ class Application(ApplicationPartDelete, ApplicationPartHead,
             except PermissionError as e:
                 logger.error("PermissionError: %s", e)
                 status, headers, answer, xml_request = httputils.INTERNAL_SERVER_ERROR
+            except Exception as e:
+                logger.error("Exception: %s", e)
+                logging.error("%s", traceback.format_exc())
+                status, headers, answer, xml_request = httputils.INTERNAL_SERVER_ERROR
 
             # Profiling
             if self._profiling_per_request:
diff --git a/radicale/app/options.py b/radicale/app/options.py
index 9e347de2..bcb3663e 100644
--- a/radicale/app/options.py
+++ b/radicale/app/options.py
@@ -3,7 +3,7 @@
 # Copyright © 2008 Pascal Halter
 # Copyright © 2008-2017 Guillaume Ayoub
 # Copyright © 2017-2021 Unrud <unrud@outlook.com>
-# Copyright © 2025-2025 Peter Bieringer <pb@bieringer.de>
+# Copyright © 2025-2026 Peter Bieringer <pb@bieringer.de>
 #
 # This library is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -18,6 +18,7 @@
 # You should have received a copy of the GNU General Public License
 # along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
 
+import os
 from http import client
 
 from radicale import httputils, types
@@ -33,4 +34,7 @@ class ApplicationPartOptions(ApplicationBase):
             "Allow": ", ".join(
                 name[3:] for name in dir(self) if name.startswith("do_")),
             "DAV": httputils.DAV_HEADERS}
+        if 'PYTEST_VERSION' in os.environ and 'PYTEST_RADICALE_RAISE_GENERIC_ERROR' in os.environ:
+            # trigger special test case
+            raise ValueError('PYTEST_RADICALE_RAISE_GENERIC_ERROR')
         return client.OK, headers, None, None
diff --git a/radicale/tests/test_base.py b/radicale/tests/test_base.py
index d17f3d15..b36497dd 100644
--- a/radicale/tests/test_base.py
+++ b/radicale/tests/test_base.py
@@ -720,6 +720,24 @@ permissions: RrWw""")
         _, headers, _ = self.request("OPTIONS", "/", check=200)
         assert "DAV" in headers
 
+    def test_server_error_delay_basic(self) -> None:
+        """Trigger a server error and check delay."""
+        delay = .3
+        delay_min = delay * 0.9  # no random jitter during test
+        delay_max = delay + 0.2  # no random jitter during test
+        if sys.platform == "darwin":  # no reliable sleep times
+            delay_max = delay_max * 1.5
+
+        self.configure({"server": {"delay_on_error": delay}})
+        os.environ["PYTEST_RADICALE_RAISE_GENERIC_ERROR"] = "1"
+        time_begin = datetime.datetime.now()
+        _, headers, answer = self.request("OPTIONS", "/", check=500)
+        time_end = datetime.datetime.now()
+        time_delta = (time_end - time_begin).total_seconds()
+        assert time_delta > delay_min
+        assert time_delta < delay_max
+        del os.environ["PYTEST_RADICALE_RAISE_GENERIC_ERROR"]
+
     def test_delete_collection(self) -> None:
         """Delete a collection."""
         self.mkcalendar("/calendar.ics/")