From 3ddc3204bb98f7e66d4544751c4e98d7e12544e1 Mon Sep 17 00:00:00 2001
From: Luke Hubmayer-Werner <mongoose41@gmail.com>
Date: Fri, 4 Feb 2022 13:15:10 +1030
Subject: [PATCH] empty cache handling

---
 src/main.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index d12a06c..ab1493c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -88,7 +88,11 @@ fn simulate(guess: &str, solution: &str, wordcache: &HashMap<String, Vec<String>
         }
     }
     let re = Regex::new(&re_str).unwrap();
-    wordcache[&hs2str(&required_chars)].iter().filter(|w| re.is_match(w)).cloned().collect()
+    let cachekey = hs2str(&required_chars);
+    match wordcache.contains_key(&cachekey) {
+        true => wordcache[&cachekey].iter().filter(|w| re.is_match(w)).cloned().collect(),
+        false => Vec::<String>::new(),
+    }
 }
 
 fn find_worstcase(word: &str, wordcache: &HashMap<String, Vec<String>>) -> String {