From 940b3722cf80d3b4dd0855c5b70c167311299b28 Mon Sep 17 00:00:00 2001
From: crsp6447 <crsp6447@pm.me>
Date: Mon, 27 Apr 2026 22:53:14 +0200
Subject: [PATCH] Fix: Prevent crash in cachingAtDepthForOpenRouterClaude on
 empty content from trailing tool calls (#5541)

* Prevent crash in cachingAtDepthForOpenRouterClaude when message has no text

* Apply optional chaining suggestion
---
 src/prompt-converters.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/prompt-converters.js b/src/prompt-converters.js
index f033c8462..34ae3b388 100644
--- a/src/prompt-converters.js
+++ b/src/prompt-converters.js
@@ -1040,7 +1040,7 @@ export function cachingAtDepthForOpenRouterClaude(messages, cachingAtDepth, ttl)
                         text: content,
                         cache_control: { type: 'ephemeral', ttl: ttl },
                     }];
-                } else {
+                } else if (content?.length > 0) {
                     const contentPartCount = content.length;
                     content[contentPartCount - 1].cache_control = {
                         type: 'ephemeral',