fix ol

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## 2.0.2
+
+### Fixed
+
+- Fixed OptionList.add_options exhausting iterator https://github.com/Textualize/textual/pull/5540
+
 ## 2.0.1 - 2024-02-16
 
 ### Fixed

src/textual/widgets/_option_list.py

@@ -320,6 +320,8 @@ def add_options(self, new_options: Iterable[OptionListContent]) -> Self:
             new_options: Content of new options.
         """
 
+        new_options = list(new_options)
+
         option_ids = [
             option._id
             for option in new_options
@@ -330,7 +332,6 @@ def add_options(self, new_options: Iterable[OptionListContent]) -> Self:
                 "New options contain duplicated IDs; Ensure that the IDs are unique."
             )
 
-        new_options = list(new_options)
         if not new_options:
             return self
         if new_options[0] is None: