lib/write_xlsx/workbook.rb in write_xlsx-0.85.8 vs lib/write_xlsx/workbook.rb in write_xlsx-0.85.9

@@ -925,10 +925,10 @@
     # unique colors. The WriteXLSX gem will be extended at a later stage to
     # support the newer, semi-infinite, palette.
     #
     def set_custom_color(index, red = 0, green = 0, blue = 0)
       # Match a HTML #xxyyzz style parameter
-      if red =~ /^#(\w\w)(\w\w)(\w\w)/
+      if red.to_s =~ /^#(\w\w)(\w\w)(\w\w)/
         red   = $1.hex
         green = $2.hex
         blue  = $3.hex
       end