diff --git a/kong/plugins/prometheus/exporter.lua b/kong/plugins/prometheus/exporter.lua
index f25eeeaeb012..2a94ebac272c 100644
--- a/kong/plugins/prometheus/exporter.lua
+++ b/kong/plugins/prometheus/exporter.lua
@@ -331,19 +331,10 @@ local function log(message, serialized)
 
   if serialized.ai_metrics then
     for _, ai_plugin in pairs(serialized.ai_metrics) do
-      local cache_status
-      if ai_plugin.cache and ai_plugin.cache.cache_status then
-        cache_status = ai_plugin.cache.cache_status
-      end
-
-      local vector_db, embeddings_provider, embeddings_model
-      if ai_plugin.cache then
-        vector_db = ai_plugin.cache.vector_db
-
-        embeddings_provider = ai_plugin.cache.embeddings_provider
-
-        embeddings_model = ai_plugin.cache.embeddings_model
-      end
+      local cache_status = ai_plugin.cache.cache_status or ""
+      local vector_db = ai_plugin.cache.vector_db or ""
+      local embeddings_provider = ai_plugin.cache.embeddings_provider or ""
+      local embeddings_model = ai_plugin.cache.embeddings_model or ""
 
       labels_table_ai_llm_status[1] = ai_plugin.meta.provider_name
       labels_table_ai_llm_status[2] = ai_plugin.meta.request_model
diff --git a/spec/03-plugins/38-ai-proxy/02-openai_integration_spec.lua b/spec/03-plugins/38-ai-proxy/02-openai_integration_spec.lua
index 933d8f6450ae..37f7d8ac9c1b 100644
--- a/spec/03-plugins/38-ai-proxy/02-openai_integration_spec.lua
+++ b/spec/03-plugins/38-ai-proxy/02-openai_integration_spec.lua
@@ -46,10 +46,10 @@ local _EXPECTED_CHAT_STATS = {
       response_model = 'gpt-3.5-turbo-0613',
     },
     usage = {
-      completion_tokens = 12,
-      cost = 0.00037,
       prompt_tokens = 25,
+      completion_tokens = 12,
       total_tokens = 37,
+      cost = 0.00037,
     },
     cache = {}
   },
diff --git a/spec/03-plugins/39-ai-request-transformer/02-integration_spec.lua b/spec/03-plugins/39-ai-request-transformer/02-integration_spec.lua
index 5ec5f94c5c18..0e8014dc5fee 100644
--- a/spec/03-plugins/39-ai-request-transformer/02-integration_spec.lua
+++ b/spec/03-plugins/39-ai-request-transformer/02-integration_spec.lua
@@ -126,10 +126,10 @@ local _EXPECTED_CHAT_STATS = {
       response_model = 'gpt-3.5-turbo-0613',
     },
     usage = {
-      completion_tokens = 12,
-      cost = 0.00037,
       prompt_tokens = 25,
+      completion_tokens = 12,
       total_tokens = 37,
+      cost = 0.00037,
     },
     cache = {}
   },
diff --git a/spec/03-plugins/40-ai-response-transformer/02-integration_spec.lua b/spec/03-plugins/40-ai-response-transformer/02-integration_spec.lua
index 395897a9eebe..34f5afab3b6c 100644
--- a/spec/03-plugins/40-ai-response-transformer/02-integration_spec.lua
+++ b/spec/03-plugins/40-ai-response-transformer/02-integration_spec.lua
@@ -183,10 +183,10 @@ local _EXPECTED_CHAT_STATS = {
       response_model = 'gpt-3.5-turbo-0613',
     },
     usage = {
-      completion_tokens = 12,
-      cost = 0.00037,
       prompt_tokens = 25,
+      completion_tokens = 12,
       total_tokens = 37,
+      cost = 0.00037,
     },
     cache = {}
   },