fix empty history panic

1 files changed, 3 insertions, 0 deletions

diff --git a/src/command.rs b/src/command.rs
index d80f1f2..f5a24c9 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -81,6 +81,9 @@ impl CommandBox {
     }
 
     pub fn hist_prev(&mut self) {
+        if self.history.items.is_empty() {
+            return;
+        }
         if let Some(idx) = self.hist_idx {
             if !(idx + 1 >= self.history.items.len()) {
                 self.hist_idx = Some(idx + 1);