Update app.py

app.py

@@ -39,7 +39,10 @@ if use_custom_weights:
 def add_overlay(image: Image.Image, label: str) -> Image.Image:
     image = image.copy()
     draw = ImageDraw.Draw(image)
-    font = ImageFont.load_default()
+    try:
+        font = ImageFont.load_default()
+    except:
+        font = None
     draw.text((10, 10), label, fill="white", font=font)
     return image