diff --git a/src/lib.rs b/src/lib.rs
index 723148d..8a9e717 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1132,7 +1132,9 @@ impl Parser {
                 }
 
                 if idx + 3 < len_l && &tokens[idx + 3] == sep {
-                    if let Some(value) = info.month_index(&tokens[idx + 4]) {
+                    if tokens.len() <= idx + 4 {
+                        return Err(ParseError::UnrecognizedFormat);
+                    } else if let Some(value) = info.month_index(&tokens[idx + 4]) {
                         ymd.append(value as i32, &tokens[idx + 4], Some(YMDLabel::Month))?;
                     } else if let Ok(val) = tokens[idx + 4].parse::<i32>() {
                         ymd.append(val, &tokens[idx + 4], None)?;
diff --git a/src/tests/fuzzing.rs b/src/tests/fuzzing.rs
index 55befea..2e7400b 100644
--- a/src/tests/fuzzing.rs
+++ b/src/tests/fuzzing.rs
@@ -96,4 +96,11 @@ fn github_36() {
     let parse_str = str::from_utf8(&parse_vec).unwrap();
     let parse_result = parse(parse_str);
     assert!(parse_result.is_err());
+}
+
+#[test]
+fn github_45() {
+    assert!(parse("/2018-fifa-").is_err());
+    assert!(parse("/2009/07/").is_err());
+    assert!(parse("2021-09-").is_err());
 }
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