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Diffstat (limited to 'app/models/tracker.rb')
| -rw-r--r-- | app/models/tracker.rb | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/app/models/tracker.rb b/app/models/tracker.rb index bfec75e70..ef2f48b04 100644 --- a/app/models/tracker.rb +++ b/app/models/tracker.rb @@ -93,6 +93,8 @@ class Tracker < ActiveRecord::Base def to_s; name end def <=>(tracker) + return nil unless tracker.is_a?(Tracker) + position <=> tracker.position end |