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-rw-r--r--lib/csv/writer.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/csv/writer.rb b/lib/csv/writer.rb
index 9243d23641..6c02d7473e 100644
--- a/lib/csv/writer.rb
+++ b/lib/csv/writer.rb
@@ -156,7 +156,7 @@ class CSV
else
field = String(field) # Stringify fields
# represent empty fields as empty quoted fields
- if (@quote_empty and field.empty?) or @quotable_pattern.match?(field)
+ if (@quote_empty and field.empty?) or (field.valid_encoding? and @quotable_pattern.match?(field))
quote_field(field)
else
field # unquoted field