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-rw-r--r--actionpack/lib/action_controller/metal/live.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/metal/live.rb b/actionpack/lib/action_controller/metal/live.rb
index b1c2391afe..5680ef08a1 100644
--- a/actionpack/lib/action_controller/metal/live.rb
+++ b/actionpack/lib/action_controller/metal/live.rb
@@ -297,7 +297,7 @@ module ActionController
return unless logger
logger.fatal do
- message = "\n#{exception.class} (#{exception.message}):\n".dup
+ message = +"\n#{exception.class} (#{exception.message}):\n"
message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code)
message << " " << exception.backtrace.join("\n ")
"#{message}\n\n"