diff --git a/src/history/file.rs b/src/history/file.rs
index 5a223cf82..7afa5a429 100644
--- a/src/history/file.rs
+++ b/src/history/file.rs
@@ -369,7 +369,9 @@ fn extract_prefix_and_unescape_yaml(line: &[u8]) -> Option<(Cow<[u8]>, Cow<[u8]>
 fn decode_item_fish_2_0(mut data: &[u8]) -> Option<HistoryItem> {
     let (advance, line) = read_line(data);
     let line = trim_start(line);
-    assert!(line.starts_with(b"- cmd"));
+    if !line.starts_with(b"- cmd") {
+        return None;
+    }
 
     let (_key, value) = extract_prefix_and_unescape_yaml(line)?;