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@@ -145,7 +145,7 @@ module Prawn
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         @col_widths = [0] * @data[0].length    
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         renderable_data.each do |row|
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           row.each_with_index do |cell,i|
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-            length = cell.lines.map { |e| 
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+            length = cell.to_s.lines.map { |e| 
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               @document.font_metrics.string_width(e,@font_size) }.max.to_f +
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                 2*@horizontal_padding
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             @col_widths[i] = length if length > @col_widths[i]
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@@ -174,7 +174,7 @@ module Prawn
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             row.each_with_index do |e,i|
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               c << Prawn::Graphics::Cell.new(
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                 :document => @document, 
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-                :text     => e, 
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+                :text     => e.to_s, 
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                 :width    => @col_widths[i],
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                 :horizontal_padding => @horizontal_padding,
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                 :vertical_padding => @vertical_padding,