diff --git a/web/src/app/chat/message/CodeBlock.tsx b/web/src/app/chat/message/CodeBlock.tsx
index 8c6d984a4c..297ccf4933 100644
--- a/web/src/app/chat/message/CodeBlock.tsx
+++ b/web/src/app/chat/message/CodeBlock.tsx
@@ -51,6 +51,27 @@ export function CodeBlock({
     }
   }
 
+  // handle unknown languages. They won't have a `node.position.start.offset`
+  if (!codeText) {
+    const findTextNode = (node: any): string | null => {
+      if (node.type === "text") {
+        return node.value;
+      }
+      let finalResult = "";
+      if (node.children) {
+        for (const child of node.children) {
+          const result = findTextNode(child);
+          if (result) {
+            finalResult += result;
+          }
+        }
+      }
+      return finalResult;
+    };
+
+    codeText = findTextNode(props.node);
+  }
+
   const handleCopy = () => {
     if (!codeText) {
       return;
diff --git a/web/src/app/chat/message/Messages.tsx b/web/src/app/chat/message/Messages.tsx
index 47623f7e5c..8a2d461c4a 100644
--- a/web/src/app/chat/message/Messages.tsx
+++ b/web/src/app/chat/message/Messages.tsx
@@ -236,7 +236,7 @@ export const AIMessage = ({
                       ),
                     }}
                     remarkPlugins={[remarkGfm]}
-                    rehypePlugins={[rehypePrism]}
+                    rehypePlugins={[[rehypePrism, { ignoreMissing: true }]]}
                   >
                     {content}
                   </ReactMarkdown>