array_reverse(): Argument #1 ($array) must be of type array, null given

Call Stack

1. in TreeService.php line 130
2. at array_reverse() in TreeService.php line 130
3. at TreeService->get_pos() in Fuwu.php line 98
4. at Fuwu->index()
5. at ReflectionMethod->invokeArgs() in Container.php line 344
6. at Container->invokeReflectMethod() in Controller.php line 110
7. at Controller->think\route\dispatch\{closure}() in Pipeline.php line 59
8. at Pipeline->think\{closure}() in Browers.php line 72
9. at Browers->handle()
10. at call_user_func() in Middleware.php line 142
11. at Middleware->think\{closure}() in Pipeline.php line 85
12. at Pipeline->think\{closure}() in Pipeline.php line 66
13. at Pipeline->then() in Controller.php line 84
14. at Controller->exec() in Dispatch.php line 80
15. at Dispatch->run() in Route.php line 793
16. at Route->think\{closure}() in Pipeline.php line 59
17. at Pipeline->think\{closure}() in Pipeline.php line 66
18. at Pipeline->then() in Route.php line 792
19. at Route->dispatch() in Http.php line 216
20. at Http->dispatchToRoute() in Http.php line 206
21. at Http->think\{closure}() in Pipeline.php line 59
22. at Pipeline->think\{closure}() in MultiApp.php line 51
23. at MultiApp->think\app\{closure}() in Pipeline.php line 59
24. at Pipeline->think\{closure}() in Pipeline.php line 66
25. at Pipeline->then() in MultiApp.php line 50
26. at MultiApp->handle()
27. at call_user_func() in Middleware.php line 142
28. at Middleware->think\{closure}() in Pipeline.php line 85
29. at Pipeline->think\{closure}() in SessionInit.php line 67
30. at SessionInit->handle()
31. at call_user_func() in Middleware.php line 142
32. at Middleware->think\{closure}() in Pipeline.php line 85
33. at Pipeline->think\{closure}() in LoadLangPack.php line 57
34. at LoadLangPack->handle()
35. at call_user_func() in Middleware.php line 142
36. at Middleware->think\{closure}() in Pipeline.php line 85
37. at Pipeline->think\{closure}() in TraceDebug.php line 71
38. at TraceDebug->handle()
39. at call_user_func() in Middleware.php line 142
40. at Middleware->think\{closure}() in Pipeline.php line 85
41. at Pipeline->think\{closure}() in Pipeline.php line 66
42. at Pipeline->then() in Http.php line 205
43. at Http->runWithRequest() in Http.php line 170
44. at Http->run() in index.php line 22