Trying to access array offset on value of type null

Call Stack

1. in Term.php line 63
2. at Error->appError() in Term.php line 63
3. at Term->getTerm()
4. at call_user_func_array() in Facade.php line 96
5. at Facade::__callStatic() in function-view.php line 644
6. at get_term_name() in slot_filter.php line 40
7. at Php->{closure}()
8. at array_reduce() in slot_filter.php line 42
9. at include('/www/wwwroot/qu16428...') in main.php line 79
10. at include('/www/wwwroot/qu16428...') in Php.php line 88
11. at Php->fetch() in View.php line 90
12. at View->think\{closure}() in View.php line 126
13. at View->getContent() in View.php line 91
14. at View->fetch()
15. at call_user_func_array() in Facade.php line 96
16. at Facade::__callStatic() in BaseComponent.php line 267
17. at BaseComponent->content()
18. at call_user_func_array() in Facade.php line 96
19. at Facade::__callStatic() in DataView.php line 2
20. at DataView::row() in DataView.php line 2
21. at DataView::row() in DataView.php line 2
22. at DataView::row() in DataView.php line 2
23. at DataView::loop() in DataView.php line 2
24. at DataView::row() in DataView.php line 2
25. at DataView::row() in DataView.php line 2
26. at DataView::row() in DataView.php line 2
27. at DataView::do() in function-view.php line 227
28. at vc_view() in Index.php line 307
29. at Index->page()
30. at ReflectionMethod->invokeArgs() in Container.php line 344
31. at Container->invokeReflectMethod() in Controller.php line 110
32. at Controller->think\route\dispatch\{closure}() in Pipeline.php line 59
33. at Pipeline->think\{closure}() in Pipeline.php line 66
34. at Pipeline->then() in Controller.php line 113
35. at Controller->exec() in Dispatch.php line 90
36. at Dispatch->run() in Route.php line 785
37. at Route->think\{closure}() in Pipeline.php line 59
38. at Pipeline->think\{closure}() in Pipeline.php line 66
39. at Pipeline->then() in Route.php line 786
40. at Route->dispatch() in Http.php line 216
41. at Http->dispatchToRoute() in Http.php line 206
42. at Http->think\{closure}() in Pipeline.php line 59
43. at Pipeline->think\{closure}() in SessionInit.php line 67
44. at SessionInit->handle()
45. at call_user_func() in Middleware.php line 142
46. at Middleware->think\{closure}() in Pipeline.php line 85
47. at Pipeline->think\{closure}() in LoadLangPack.php line 57
48. at LoadLangPack->handle()
49. at call_user_func() in Middleware.php line 142
50. at Middleware->think\{closure}() in Pipeline.php line 85
51. at Pipeline->think\{closure}() in TraceDebug.php line 71
52. at TraceDebug->handle()
53. at call_user_func() in Middleware.php line 142
54. at Middleware->think\{closure}() in Pipeline.php line 85
55. at Pipeline->think\{closure}() in Pipeline.php line 66
56. at Pipeline->then() in Http.php line 207
57. at Http->runWithRequest() in Http.php line 170
58. at Http->run() in index.php line 11