1 files changed, 4 insertions, 0 deletions
diff --git a/utf8.lua b/utf8.lua
index 3db6642..72177c2 100644
--- a/utf8.lua
+++ b/utf8.lua
@@ -100,6 +100,10 @@ end
 -- instead of bytes
 function utf8sub (s, i, j)
    j = j or -1
+
+   if i == nil then
+      return ""
+   end
    
    local pos = 1
    local bytes = string.len(s)