diff --git a/src/fairvisor/loop_detector.lua b/src/fairvisor/loop_detector.lua
index 7f2a02f..f2692ae 100644
--- a/src/fairvisor/loop_detector.lua
+++ b/src/fairvisor/loop_detector.lua
@@ -28,22 +28,23 @@ local function _is_positive_integer(value)
   return type(value) == "number" and value > 0 and floor(value) == value
 end
 
-local function _append_sorted_key_values(parts, values, scratch_keys)
-  if type(values) ~= "table" or next(values) == nil then
+local function _append_sorted_key_values(parts, kv, scratch_keys)
+  if type(kv) ~= "table" or next(kv) == nil then
     return
   end
 
-  while #scratch_keys > 0 do
-    scratch_keys[#scratch_keys] = nil
+  for i = 1, #scratch_keys do
+    scratch_keys[i] = nil
   end
-  for key in pairs(values) do
+
+  for key in pairs(kv) do
     scratch_keys[#scratch_keys + 1] = key
   end
   table_sort(scratch_keys)
 
   for i = 1, #scratch_keys do
     local key = scratch_keys[i]
-    parts[#parts + 1] = tostring(key) .. "=" .. tostring(values[key])
+    parts[#parts + 1] = tostring(key) .. "=" .. tostring(kv[key])
   end
 end
 
@@ -110,9 +111,10 @@ function _M.validate_config(config)
 end
 
 function _M.build_fingerprint(method, path, query_params, body_hash, limit_key_values)
-  while #_parts > 0 do
-    _parts[#_parts] = nil
+  for i = 1, #_parts do
+    _parts[i] = nil
   end
+
   _parts[1] = tostring(method or "")
   _parts[2] = tostring(path or "")
 
diff --git a/src/fairvisor/rule_engine.lua b/src/fairvisor/rule_engine.lua
index 455c6a4..bb8dcf9 100644
--- a/src/fairvisor/rule_engine.lua
+++ b/src/fairvisor/rule_engine.lua
@@ -433,9 +433,10 @@ end
 
 local function _build_decision_from_loop(loop_result, policy_id)
   local action = "reject"
-  if loop_result.allowed == true or loop_result.action == "warn" then
+  local loop_action = loop_result and loop_result.action
+  if loop_result.allowed == true or loop_action == "warn" then
     action = "allow"
-  elseif loop_result.action == "throttle" then
+  elseif loop_action == "throttle" then
     action = "throttle"
   end
 
@@ -707,7 +708,7 @@ function _M.evaluate(request_context, bundle)
       if loop_cfg and loop_cfg.enabled then
         local fingerprint = _call(
           _loop_detector.build_fingerprint,
-          "",
+          0,
           request_context and request_context.method,
           request_context and request_context.path,
           request_context and request_context.query_params,