diff --git a/src/piv.rs b/src/piv.rs
index 78ba16d..df611ea 100644
--- a/src/piv.rs
+++ b/src/piv.rs
@@ -565,8 +565,10 @@ impl Key {
             };
 
             if !buf.is_empty() {
-                let cert = Certificate::from_bytes(buf)?;
-                keys.push(Key { slot, cert });
+	        match Certificate::from_bytes(buf) {
+		        Ok(cert) => keys.push(Key { slot, cert }),
+			Err(Error::InvalidObject) => {}        // skip slots we can't parse (e.g. Ed25519)
+			Err(other) => return Err(other),
             }
         }