From d7ea6769cb47a97ccf4b743e343ea42712eab0cd Mon Sep 17 00:00:00 2001
From: KernelDeimos <7225168+KernelDeimos@users.noreply.github.com>
Date: Tue, 4 Nov 2025 22:27:19 -0500
Subject: [PATCH] fix: check if system_prompts is an empty array

It was assumpted that `system_prompts[0]` could not be undefined which
is not accurate because sometimes there are no system prompts.
---
 src/backend/src/modules/puterai/ClaudeService.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/backend/src/modules/puterai/ClaudeService.js b/src/backend/src/modules/puterai/ClaudeService.js
index b5d11e7f..187f74e0 100644
--- a/src/backend/src/modules/puterai/ClaudeService.js
+++ b/src/backend/src/modules/puterai/ClaudeService.js
@@ -128,7 +128,11 @@ class ClaudeService extends BaseService {
                 [system_prompts, messages] = Messages.extract_and_remove_system_messages(messages);
 
                 // Apply the cache control tag to all content blocks
-                if (system_prompts[0].cache_control && system_prompts[0]?.content) {
+                if (
+                    system_prompts.length > 0 &&
+                    system_prompts[0].cache_control &&
+                    system_prompts[0]?.content
+                ) {
                     system_prompts[0].content = system_prompts[0].content.map(prompt => {
                         prompt.cache_control = system_prompts[0].cache_control;
                         return prompt;