diff --git a/addons/mrp/report/mrp_report_bom_structure.py b/addons/mrp/report/mrp_report_bom_structure.py
index b9108828b37..cb6f598fef9 100644
--- a/addons/mrp/report/mrp_report_bom_structure.py
+++ b/addons/mrp/report/mrp_report_bom_structure.py
@@ -208,8 +208,6 @@ class ReportBomStructure(models.AbstractModel):
 
     def _get_pdf_line(self, bom_id, product_id=False, qty=1, child_bom_ids=[], unfolded=False):
 
-        data = self._get_bom(bom_id=bom_id, product_id=product_id.id, line_qty=qty)
-
         def get_sub_lines(bom, product_id, line_qty, line_id, level):
             data = self._get_bom(bom_id=bom.id, product_id=product_id.id, line_qty=line_qty, line_id=line_id, level=level)
             bom_lines = data['components']
@@ -253,6 +251,7 @@ class ReportBomStructure(models.AbstractModel):
 
         bom = self.env['mrp.bom'].browse(bom_id)
         product = product_id or bom.product_id or bom.product_tmpl_id.product_variant_id
+        data = self._get_bom(bom_id=bom_id, product_id=product.id, line_qty=qty)
         pdf_lines = get_sub_lines(bom, product, qty, False, 1)
         data['components'] = []
         data['lines'] = pdf_lines