diff --git a/lib/fluent/plugin/output.rb b/lib/fluent/plugin/output.rb
index abaa29fa72..ce2a5ffc0b 100644
--- a/lib/fluent/plugin/output.rb
+++ b/lib/fluent/plugin/output.rb
@@ -28,6 +28,7 @@
 require 'fluent/clock'
 require 'fluent/ext_monitor_require'
 
+require 'json'
 require 'time'
 
 module Fluent
@@ -1212,7 +1213,7 @@ def next_flush_time
         end
       end
 
-      UNRECOVERABLE_ERRORS = [Fluent::UnrecoverableError, TypeError, ArgumentError, NoMethodError, MessagePack::UnpackError, EncodingError]
+      UNRECOVERABLE_ERRORS = [Fluent::UnrecoverableError, TypeError, ArgumentError, NoMethodError, MessagePack::UnpackError, EncodingError, JSON::GeneratorError]
 
       def try_flush
         chunk = @buffer.dequeue_chunk
diff --git a/test/plugin/test_output_as_buffered_backup.rb b/test/plugin/test_output_as_buffered_backup.rb
index 73e628c9ad..2956fbf393 100644
--- a/test/plugin/test_output_as_buffered_backup.rb
+++ b/test/plugin/test_output_as_buffered_backup.rb
@@ -184,7 +184,9 @@ def wait_flush(target_file)
          'argument error' => ArgumentError,
          'no method error' => NoMethodError,
          'msgpack unpack error' => MessagePack::UnpackError,
-         'encoding error' => EncodingError)
+         'encoding error' => EncodingError,
+         'json generate error' => JSON::GeneratorError
+    )
     test 'backup chunk without secondary' do |error_class|
       Fluent::SystemConfig.overwrite_system_config('root_dir' => TMP_DIR) do
         id = 'backup_test'