2 files changed, 10 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/evented_file_update_checker.rb b/activesupport/lib/active_support/evented_file_update_checker.rb
index ed4604c2df..080111d799 100644
--- a/activesupport/lib/active_support/evented_file_update_checker.rb
+++ b/activesupport/lib/active_support/evented_file_update_checker.rb
@@ -74,7 +74,11 @@ module ActiveSupport
 
     def execute
       @updated.make_false
-      @block.call
+      if @block.nil?
+        raise ArgumentError, "no block given: #{self.inspect}, please pass a block when you initialize #{self.class}"
+      else
+        @block.call
+      end
     end
 
     def execute_if_updated
diff --git a/activesupport/lib/active_support/file_update_checker.rb b/activesupport/lib/active_support/file_update_checker.rb
index 2dbbfadac1..1af18541e3 100644
--- a/activesupport/lib/active_support/file_update_checker.rb
+++ b/activesupport/lib/active_support/file_update_checker.rb
@@ -74,7 +74,11 @@ module ActiveSupport
     def execute
       @last_watched   = watched
       @last_update_at = updated_at(@last_watched)
-      @block.call
+      if @block.nil?
+        raise ArgumentError, "no block given: #{self.inspect}, please pass a block when you initialize #{self.class}"
+      else
+        @block.call
+      end
     ensure
       @watched = nil
       @updated_at = nil