1 files changed, 3 insertions, 3 deletions
diff --git a/klm/lm/state.hh b/klm/lm/state.hh
index 551510a8..d8e6c132 100644
--- a/klm/lm/state.hh
+++ b/klm/lm/state.hh
@@ -56,14 +56,14 @@ inline uint64_t hash_value(const State &state, uint64_t seed = 0) {
 struct Left {
   bool operator==(const Left &other) const {
     return 
-      (length == other.length) && 
-      pointers[length - 1] == other.pointers[length - 1] &&
-      full == other.full;
+      length == other.length &&
+      (!length || (pointers[length - 1] == other.pointers[length - 1] && full == other.full));
   }
 
   int Compare(const Left &other) const {
     if (length < other.length) return -1;
     if (length > other.length) return 1;
+    if (length == 0) return 0; // Must be full.
     if (pointers[length - 1] > other.pointers[length - 1]) return 1;
     if (pointers[length - 1] < other.pointers[length - 1]) return -1;
     return (int)full - (int)other.full;