Update app.py

app.py

@@ -310,7 +310,7 @@ def generate_certificate(certificate_model, first_name, last_name):
     name_font = ImageFont.truetype("Quattrocento-Regular.ttf", 100)
     date_font = ImageFont.truetype("Quattrocento-Regular.ttf", 48)
     
-    name = first_name + " " + last_name
+    name = str(first_name) + " " + str(last_name)
     
     # Debug line name
     #d.line(((200, 740), (1800, 740)), "gray")