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-rw-r--r--activesupport/lib/active_support/cache/mem_cache_store.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/cache/mem_cache_store.rb b/activesupport/lib/active_support/cache/mem_cache_store.rb
index 1ac4819d47..0eacc4c078 100644
--- a/activesupport/lib/active_support/cache/mem_cache_store.rb
+++ b/activesupport/lib/active_support/cache/mem_cache_store.rb
@@ -46,6 +46,9 @@ module ActiveSupport
options = addresses.extract_options!
super(options)
+ unless [String, Dalli::Client, NilClass].include?(addresses.first.class)
+ raise ArgumentError, "First argument must be an empty array, an array of hosts or a Dalli::Client instance."
+ end
if addresses.first.is_a?(Dalli::Client)
@data = addresses.first
else