Fix JavaScript null pointer error in regex match chaining

- Add proper null checking for chained .match() calls
- Prevent 'missing ) after argument list' error when second match returns null
- Improve error handling in malformed JSON response extraction
- This resolves the JavaScript syntax error in page.evaluate function

olproxy.py

@@ -515,9 +515,12 @@ async def detect_json_response_with_id(page, container_selector, request_id, pro
                                                 // Try to extract just the response value if JSON parsing fails
                                                 const responseMatch = fixedJson.match(/"response"\\s*:\\s*"([^"\\\\]|\\\\.)*"/);
                                                 if (responseMatch && fixedJson.includes(requestId)) {
-                                                    const responseValue = responseMatch[0].match(/"response"\\s*:\\s*"(.*)"/)[1];
-                                                    console.log(`Extracted response from malformed JSON: ${responseValue.substring(0, 100)}...`);
-                                                    return responseValue;
+                                                    const valueMatch = responseMatch[0].match(/"response"\\s*:\\s*"(.*)"/);
+                                                    if (valueMatch && valueMatch[1]) {
+                                                        const responseValue = valueMatch[1];
+                                                        console.log(`Extracted response from malformed JSON: ${responseValue.substring(0, 100)}...`);
+                                                        return responseValue;
+                                                    }
                                                 }
                                                 
                                                 const jsonObj = JSON.parse(fixedJson);