From ee2b40c82016aeb973ab3e6eb5c6ffa807829cf5 Mon Sep 17 00:00:00 2001
From: RedFantom <redfantom@outlook.com>
Date: Fri, 6 Apr 2018 11:24:21 +0200
Subject: [PATCH] Fix RuntimeError in delete_marker if iid is tk.ALL

---
 ttkwidgets/timeline.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ttkwidgets/timeline.py b/ttkwidgets/timeline.py
index 5975a4a9..00770c5b 100644
--- a/ttkwidgets/timeline.py
+++ b/ttkwidgets/timeline.py
@@ -504,7 +504,7 @@ def delete_marker(self, iid):
         Delete a marker from the timeline based on its iid
         """
         if iid == tk.ALL:
-            for iid in self.markers.keys():
+            for iid in list(self.markers.keys()):
                 self.delete_marker(iid)
             return
         options = self._markers[iid]