diff --git a/gfx/webrender_bindings/revision.txt b/gfx/webrender_bindings/revision.txt
index 74a5bd5359f9..9a2d10d3cec5 100644
--- a/gfx/webrender_bindings/revision.txt
+++ b/gfx/webrender_bindings/revision.txt
@@ -1 +1 @@
-a2b4202242d937d328eda21c2d9fcfece609283e
+a48f34e09901a62ab12164c8e539011ed04d41bd
diff --git a/gfx/wr/webrender/src/resource_cache.rs b/gfx/wr/webrender/src/resource_cache.rs
index e8eea89398e0..95c712602aae 100644
--- a/gfx/wr/webrender/src/resource_cache.rs
+++ b/gfx/wr/webrender/src/resource_cache.rs
@@ -1063,6 +1063,10 @@ impl ResourceCache {
 
                 assert!(!descriptor.rect.is_empty());
 
+                if !self.blob_image_templates.contains_key(&request.key) {
+                    panic!("already missing blob image key {:?} deleted: {:?}", request, self.deleted_blob_keys);
+                }
+
                 self.missing_blob_images.push(
                     BlobImageParams {
                         request,