diff --git a/Cargo.lock b/Cargo.lock
index 9b33e94..1a124e9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -16,7 +16,7 @@ checksum = "f8ca58f447f06ed17d5fc4043ce1b10dd205e060fb3ce5b979b8ed8e59ff3f79"
 
 [[package]]
 name = "phasetida-core"
-version = "0.1.18"
+version = "0.1.19"
 dependencies = [
  "serde",
  "serde_json",
diff --git a/Cargo.toml b/Cargo.toml
index d89602f..3047032 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "phasetida-core"
-version = "0.1.18"
+version = "0.1.19"
 edition = "2024"
 
 [lib]
diff --git a/src/states_lines.rs b/src/states_lines.rs
index 71c6134..7e9c7b9 100644
--- a/src/states_lines.rs
+++ b/src/states_lines.rs
@@ -100,6 +100,9 @@ where
     let mut i = cache_index.clamp(0, i64::from(events.len() as u32));
     let mut last_result: TimeState = TimeState::During(0.0);
     loop {
+        if i < 0 {
+            return None;
+        }
         let op = events.get(i.max(0).unsigned_abs() as usize);
         if let Some(event) = op {
             let result = event.check_time(tick_time);
@@ -120,9 +123,6 @@ where
             }
             last_result = result;
         } else {
-            if i <= 0 {
-                return None;
-            }
             return events
                 .last()
                 .map(|x| (x, i64::from(events.len() as u32) - 1, 1.0));