diff --git a/addons/website_slides/models/slide_slide.py b/addons/website_slides/models/slide_slide.py
index c19ba8bf62b..e21c1b7bdb7 100644
--- a/addons/website_slides/models/slide_slide.py
+++ b/addons/website_slides/models/slide_slide.py
@@ -362,6 +362,10 @@ class Slide(models.Model):
             data = base64.b64decode(self.datas)
             if data.startswith(b'%PDF-'):
                 pdf = PyPDF2.PdfFileReader(io.BytesIO(data), overwriteWarnings=False, strict=False)
+                try:
+                    pdf.getNumPages()
+                except PyPDF2.utils.PdfReadError:
+                    return
                 self.completion_time = (5 * len(pdf.pages)) / 60
             else:
                 self.slide_type = 'infographic'