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-rw-r--r--lib/axlsx/workbook/worksheet/col.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/workbook/worksheet/col.rb b/lib/axlsx/workbook/worksheet/col.rb
index ff942d32..38ac7454 100644
--- a/lib/axlsx/workbook/worksheet/col.rb
+++ b/lib/axlsx/workbook/worksheet/col.rb
@@ -88,7 +88,7 @@ module Axlsx
# @see Col#outline
def outline_level=(v)
Axlsx.validate_unsigned_numeric(v)
- raise ArgumentError, 'outlineLevel must be between 0 and 7' unless 0 <= v && v <= 7
+ raise ArgumentError, 'outlineLevel must be between 0 and 7' unless v >= 0 && v <= 7
@outline_level = v
end