From 250a3eb3430de6d7b78136aa4254e4523eb58feb Mon Sep 17 00:00:00 2001
From: Michiel Nauta <m.d.nauta@hetnet.nl>
Date: Sat, 7 Apr 2012 20:34:24 +0000
Subject: [PATCH] 5595: DBError when rebuilding reference maps while Event view
 row is selected

svn: r19270
---
 src/Utils.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Utils.py b/src/Utils.py
index 777803452..916358d97 100644
--- a/src/Utils.py
+++ b/src/Utils.py
@@ -1514,7 +1514,15 @@ def navigation_label(db, nav_type, handle):
     elif nav_type == 'Event':
         obj = db.get_event_from_handle(handle)
         if obj:
-            who = get_participant_from_event(db, handle)
+            try:
+                who = get_participant_from_event(db, handle)
+            except:
+                # get_participants_from_event fails when called during a magic
+                # batch transaction because find_backlink_handles tries to
+                # access the reference_map_referenced_map which doesn't exist
+                # under those circumstances. Since setting the navigation_label
+                # is inessential, just accept this and go on.
+                who = ''
             desc = obj.get_description()
             label = obj.get_type()
             if desc: