--- a/gfx/webrender_bindings/src/moz2d_renderer.rs
+++ b/gfx/webrender_bindings/src/moz2d_renderer.rs
@@ -416,17 +416,16 @@ impl BlobImageRenderer for Moz2dImageRen
                         process_native_font_handle(key, handle);
                     }
                 }
                 resources.get_font_data(key);
             }
         }
         {
             let mut index = BlobReader::new(&commands);
-            assert!(index.reader.pos < index.reader.buf.len());
             while index.reader.pos < index.reader.buf.len() {
                 let e  = index.read_entry();
                 process_fonts(BufReader::new(&commands[e.end..e.extra_end]), resources);
             }
         }
 
         self.workers.spawn(move || {
             let buf_size = (descriptor.width