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-rw-r--r--activesupport/lib/active_support/values/time_zone.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/values/time_zone.rb b/activesupport/lib/active_support/values/time_zone.rb
index 01aea0984b..37979fa3ee 100644
--- a/activesupport/lib/active_support/values/time_zone.rb
+++ b/activesupport/lib/active_support/values/time_zone.rb
@@ -223,6 +223,7 @@ module ActiveSupport
# Compare this time zone to the parameter. The two are compared first on
# their offsets, and then by name.
def <=>(zone)
+ return unless zone.respond_to?(:utc_offset) && zone.respond_to?(:name)
result = (utc_offset <=> zone.utc_offset)
result = (name <=> zone.name) if result == 0
result