diff --git a/src/kleinanzeigen_bot/__init__.py b/src/kleinanzeigen_bot/__init__.py
index 9f0e553..553affb 100644
--- a/src/kleinanzeigen_bot/__init__.py
+++ b/src/kleinanzeigen_bot/__init__.py
@@ -1184,12 +1184,20 @@ def main(args:list[str]) -> None:
     loggers.configure_console_logging()
 
     signal.signal(signal.SIGINT, error_handlers.on_sigint)  # capture CTRL+C
-    sys.excepthook = error_handlers.on_exception
+
+    # sys.excepthook = error_handlers.on_exception
+    # -> commented out because it causes PyInstaller to log "[PYI-28040:ERROR] Failed to execute script '__main__' due to unhandled exception!",
+    #    despite the exceptions being properly processed by our custom error_handlers.on_exception callback.
+    #    We now handle exceptions explicitly using a top-level try/except block.
+
     atexit.register(loggers.flush_all_handlers)
 
-    bot = KleinanzeigenBot()
-    atexit.register(bot.close_browser_session)
-    nodriver.loop().run_until_complete(bot.run(args))
+    try:
+        bot = KleinanzeigenBot()
+        atexit.register(bot.close_browser_session)
+        nodriver.loop().run_until_complete(bot.run(args))
+    except Exception:
+        error_handlers.on_exception(*sys.exc_info())
 
 
 if __name__ == "__main__":
diff --git a/src/kleinanzeigen_bot/resources/translations.de.yaml b/src/kleinanzeigen_bot/resources/translations.de.yaml
index 469bd5a..1ed9c42 100644
--- a/src/kleinanzeigen_bot/resources/translations.de.yaml
+++ b/src/kleinanzeigen_bot/resources/translations.de.yaml
@@ -201,6 +201,7 @@ kleinanzeigen_bot/utils/error_handlers.py:
     "Aborted on user request.": "Auf Benutzeranfrage abgebrochen."
   on_exception:
     "%s: %s": "%s: %s"
+    "Unknown exception occurred (missing exception info): ex_type=%s, ex_value=%s": "Unbekannter Fehler aufgetreten (fehlende Fehlerinformation):  ex_type=%s, ex_value=%s"
 
 #################################################
 kleinanzeigen_bot/utils/dicts.py:
diff --git a/src/kleinanzeigen_bot/utils/error_handlers.py b/src/kleinanzeigen_bot/utils/error_handlers.py
index 6867b74..87c9e85 100644
--- a/src/kleinanzeigen_bot/utils/error_handlers.py
+++ b/src/kleinanzeigen_bot/utils/error_handlers.py
@@ -5,14 +5,18 @@ SPDX-ArtifactOfProjectHomePage: https://github.com/Second-Hand-Friends/kleinanze
 """
 import sys, traceback
 from types import FrameType, TracebackType
-from typing import Any, Final
+from typing import Final
 
 from . import loggers
 
 LOG:Final[loggers.Logger] = loggers.get_logger(__name__)
 
 
-def on_exception(ex_type:type[BaseException], ex_value:Any, ex_traceback:TracebackType | None) -> None:
+def on_exception(ex_type: type[BaseException] | None, ex_value: BaseException | None, ex_traceback: TracebackType | None) -> None:
+    if ex_type is None or ex_value is None:
+        LOG.error("Unknown exception occurred (missing exception info): ex_type=%s, ex_value=%s", ex_type, ex_value)
+        return
+
     if issubclass(ex_type, KeyboardInterrupt):
         sys.__excepthook__(ex_type, ex_value, ex_traceback)
     elif loggers.is_debug(LOG) or isinstance(ex_value, (AttributeError, ImportError, NameError, TypeError)):