[Python] FPDF creates a pdf file with 1 extra page with every iteration

I've got a function from FPDF library to create pdf. Let's say, i have 4 orders and i need to create pdf for each of them, so i loop through them,

orders = [10, 11, 12, 13]
for o in orders:
generate_pdf(o)


Function generate_pdf:

from fpdf import FPDF
pdf = FPDF()
def generate_pdf(DokId):
pdf.add_page()
header = "Order #{}".format(DokId)

pdf.set_font('Arial', 'B', 20)
w = pdf.get_string_width(header) + 6
pdf.set_x((210 - w) / 2)
pdf.cell(w, 9, header, 0, 0, 'C')
pdf.line(20, 18, 210-20, 18)
pdf.output('{}.pdf'.format(DokId), 'F')
return None


For first el in my list i've got file "10.pdf" with 1 page, for the next one - 2 pages, etc. How to avoid this case and create only one page for each order number in a loop?

Thanks in advance

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