diff --git a/lua/git/object.lua b/lua/git/object.lua
index fab9ef4..735390d 100644
--- a/lua/git/object.lua
+++ b/lua/git/object.lua
@@ -183,7 +183,7 @@ function M.read_uri(buf)
     -- fs-event for buffers whose content can't have changed.
     if stdout == nil then
         local rev_sha = r:rev_parse(rev_str, true)
-        if rev_sha and rev_sha == state.sha then
+        if not rev_sha or rev_sha == state.sha then
             return
         end
         stdout = util.exec(