diff --git a/wgpu-core/src/command/bind.rs b/wgpu-core/src/command/bind.rs
index 04a992928c..73f1d9fe17 100644
--- a/wgpu-core/src/command/bind.rs
+++ b/wgpu-core/src/command/bind.rs
@@ -176,10 +176,16 @@ mod compat {
                             }
                         }
 
+                        #[derive(Clone, Debug, Error)]
+                        #[error("Unknown reason")]
+                        struct Unknown();
+
                         Err(Error::Incompatible {
                             expected_bgl: expected_bgl.error_ident(),
                             assigned_bgl: assigned_bgl.error_ident(),
-                            inner: MultiError::new(errors.drain(..)).unwrap(),
+                            inner: MultiError::new(errors.drain(..)).unwrap_or_else(|| {
+                                MultiError::new(core::iter::once(Unknown())).unwrap()
+                            }),
                         })
                     }
                 } else {