diff --git a/go/perf/codec-perf-rig/codec-perf-rig b/go/perf/codec-perf-rig/codec-perf-rig
new file mode 100755
index 0000000000..fbb49b5972
Binary files /dev/null and b/go/perf/codec-perf-rig/codec-perf-rig differ
diff --git a/go/types/value_store.go b/go/types/value_store.go
index c43abb72be..6f2a25b93c 100644
--- a/go/types/value_store.go
+++ b/go/types/value_store.go
@@ -186,7 +186,9 @@ func (lvs *ValueStore) checkChunksInCache(v Value, readValues bool) Hints {
 				reachableV = lvs.ReadValue(targetHash)
 				entry = lvs.check(targetHash)
 			}
-			d.PanicIfTrue(reachableV == nil, "Attempted to write Value containing Ref to non-existent object.", "%s\n, contains ref %s, which points to a non-existent Value.", EncodedValueWithTags(v), reachable.TargetHash())
+			if reachableV == nil {
+				d.Chk.Fail("Attempted to write Value containing Ref to non-existent object.", "%s\n, contains ref %s, which points to a non-existent Value.", v.Hash(), reachable.TargetHash())
+			}
 		}
 		if hint := entry.Hint(); !hint.IsEmpty() {
 			hints[hint] = struct{}{}