diff --git a/wt b/wt
index 766b613..df8abc0 100755
--- a/wt
+++ b/wt
@@ -17,7 +17,9 @@ arg=$(echo "${args[0]}" | sed 's/\//\\\//g')
 
 # show worktree list
 worktree_list() {
-	git worktree list
+	if git rev-parse --git-dir &> /dev/null; then
+		git worktree list
+	fi
 }
 
 help_message() {