Crawler crashes if httpmsg contains invalid characters

[bwalkerl]

I've traced an invalid data error back to 'httpmsg' => '<none>', which fails the persistent validation checks for PARAM_TEXT. Cloudflare is returning HTTP/1.1 522 <none> in the header

194a20f9045c:633129 2025-08-14 16:12:41 Adhoc task failed: tool_crawler\task\adhoc_crawl_task,Error: Data submitted is invalid
194a20f9045c:633129 2025-08-14 16:12:41 Debug info:
194a20f9045c:633129 2025-08-14 16:12:41 httpmsg: Data submitted is invalid
194a20f9045c:633129 2025-08-14 16:12:41 Backtrace:
194a20f9045c:633129 2025-08-14 16:12:41 * line 683 of /admin/tool/crawler/classes/robot/crawler.php: call to core\persistent->update()
194a20f9045c:633129 2025-08-14 16:12:41 * line 587 of /admin/tool/crawler/classes/robot/crawler.php: call to tool_crawler\robot\crawler->crawl()
194a20f9045c:633129 2025-08-14 16:12:41 * line 86 of /admin/tool/crawler/lib.php: call to tool_crawler\robot\crawler->process_queue()
194a20f9045c:633129 2025-08-14 16:12:41 * line 54 of /admin/tool/crawler/classes/task/adhoc_crawl_task.php: call to tool_crawler_crawl()
194a20f9045c:633129 2025-08-14 16:12:41 * line 411 of /lib/cronlib.php: call to tool_crawler\task\adhoc_crawl_task->execute()
194a20f9045c:633129 2025-08-14 16:12:41 * line 252 of /lib/cronlib.php: call to cron_run_inner_adhoc_task()
194a20f9045c:633129 2025-08-14 16:12:41 * line 272 of /lib/cronlib.php: call to cron_run_adhoc_task()
194a20f9045c:633129 2025-08-14 16:12:41 * line 155 of /admin/cli/adhoc_task.php: call to cron_run_failed_adhoc_tasks()