Index: channels/favicon.py
==================================================================
--- channels/favicon.py
+++ channels/favicon.py
@@ -301,11 +301,11 @@
     
 # Check for valid image binary, possibly convert or resize, then save to cache filename
 def store_image(imgdata, fn, resize=None):
 
     # Convert accepted formats -- even PNG for filtering now
-    if re.match(br'^(.PNG|GIF\d+|.{0,15}(Exif|JFIF)|\x00\x00\x01\x00|.{0,255}<svg[^>]+svg)', imgdata):
+    if re.match(br'^(.PNG|GIF\d+|.{0,15}(Exif|JFIF)|\x00\x00\x01\x00|\xFF\xD8\xFF|.{0,255}<svg[^>]+svg)', imgdata):
         try:
             # Read from byte/str
             image = Image.open(BytesIO(imgdata))
             log.FAVICON_IMAGE_TO_PNG(image, image.size, resize)