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Line 212: Line 212:  
     if previous_cell then
 
     if previous_cell then
 
        if row_values[column].values.node == previous_cell.values.node then
 
        if row_values[column].values.node == previous_cell.values.node then
        previous_cell.rowspan = previous_cell.rowspan + 1
+
        previous_cell.rowspan = previous_cell.rowspan and previous_cell.rowspan + 1 or 2
 
        row_values[column] = nil
 
        row_values[column] = nil
 
        else
 
        else
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