diff --git a/src/PIL/WebPImagePlugin.py b/src/PIL/WebPImagePlugin.py
index aadc71f62..a6e1a2a00 100644
--- a/src/PIL/WebPImagePlugin.py
+++ b/src/PIL/WebPImagePlugin.py
@@ -74,9 +74,9 @@ class WebPImageFile(ImageFile.ImageFile):
         self.info["background"] = (bg_r, bg_g, bg_b, bg_a)
         self.n_frames = frame_count
         self.is_animated = self.n_frames > 1
-        _, ts = self._decoder.get_next()
-        if ts:
-            self.info["duration"] = ts
+        ret = self._decoder.get_next()
+        if ret is not None:
+            self.info["duration"] = ret[1]
         self._mode = "RGB" if mode == "RGBX" else mode
         self.rawmode = mode
         self.tile = []