Check if msg.content is array before accessing first element to avoid runtime errors

Author: cezudas

packages/server/api/src/app/ai/chat/utils.ts

@@ -23,9 +23,18 @@ export function mergeToolResultsIntoMessages(
     const msg = messages[i];
 
     if (isToolMessage(msg)) {
-      const toolResult = (msg.content as any[])[0];
-      if (toolResult?.toolCallId) {
-        toolResultsToMerge.push({ toolResult, messageIndex: i });
+      if (Array.isArray(msg.content) && msg.content.length > 0) {
+        const toolResult = msg.content[0];
+        if (
+          toolResult &&
+          typeof toolResult === 'object' &&
+          'toolCallId' in toolResult
+        ) {
+          toolResultsToMerge.push({
+            toolResult: toolResult as ToolResultPart,
+            messageIndex: i,
+          });
+        }
       }
       continue;
     }