diff --git a/rootfs/etc/nginx/lua/balancer/ewma.lua b/rootfs/etc/nginx/lua/balancer/ewma.lua
index 641b5e0b7..05aae2a77 100644
--- a/rootfs/etc/nginx/lua/balancer/ewma.lua
+++ b/rootfs/etc/nginx/lua/balancer/ewma.lua
@@ -78,15 +78,15 @@ end
 
 function _M.balance(self)
   local peers = self.peers
-  local endpoint, score = peers[1], -1
+  local endpoint, ewma_score = peers[1], -1
 
   if #peers > 1 then
     local k = (#peers < PICK_SET_SIZE) and #peers or PICK_SET_SIZE
     local peer_copy = util.deepcopy(peers)
-    endpoint, score = pick_and_score(self, peer_copy, k)
+    endpoint, ewma_score = pick_and_score(self, peer_copy, k)
   end
 
-  ngx.var.balancer_ewma_score = score
+  ngx.var.balancer_ewma_score = ewma_score
 
   -- TODO(elvinefendi) move this processing to _M.sync
   return endpoint.address .. ":" .. endpoint.port
diff --git a/rootfs/etc/nginx/lua/balancer/sticky.lua b/rootfs/etc/nginx/lua/balancer/sticky.lua
index 4860c75a3..6f0aef2a9 100644
--- a/rootfs/etc/nginx/lua/balancer/sticky.lua
+++ b/rootfs/etc/nginx/lua/balancer/sticky.lua
@@ -132,13 +132,16 @@ function _M.balance(self)
   end
 
   local last_failure = self.get_last_failure()
-  local should_pick_new_upstream = last_failure ~= nil and self.cookie_session_affinity.change_on_failure or upstream_from_cookie == nil
+  local should_pick_new_upstream = last_failure ~= nil and self.cookie_session_affinity.change_on_failure or
+    upstream_from_cookie == nil
 
   if not should_pick_new_upstream then
     return upstream_from_cookie
   end
 
-  local new_upstream, key = pick_new_upstream(self)
+  local new_upstream
+
+  new_upstream, key = pick_new_upstream(self)
   if not new_upstream then
     ngx.log(ngx.WARN, string.format("failed to get new upstream; using upstream %s", new_upstream))
   elseif should_set_cookie(self) then
diff --git a/rootfs/etc/nginx/lua/configuration.lua b/rootfs/etc/nginx/lua/configuration.lua
index 3d9e1bdcf..48d61d83d 100644
--- a/rootfs/etc/nginx/lua/configuration.lua
+++ b/rootfs/etc/nginx/lua/configuration.lua
@@ -59,13 +59,14 @@ local function handle_servers()
   local err_buf = {}
   for _, server in ipairs(servers) do
     if server.hostname and server.sslCert.pemCertKey then
-      local success, err, forcible = certificate_data:set(server.hostname, server.sslCert.pemCertKey)
+      local success, set_err, forcible = certificate_data:set(server.hostname, server.sslCert.pemCertKey)
       if not success then
-        local err_msg = string.format("error setting certificate for %s: %s\n", server.hostname, tostring(err))
+        local err_msg = string.format("error setting certificate for %s: %s\n", server.hostname, tostring(set_err))
         table.insert(err_buf, err_msg)
       end
       if forcible then
-        local msg = string.format("certificate_data dictionary is full, LRU entry has been removed to store %s", server.hostname)
+        local msg = string.format("certificate_data dictionary is full, LRU entry has been removed to store %s",
+          server.hostname)
         ngx.log(ngx.WARN, msg)
       end
     else