Error an search

On entering any text in the search bar the site becomes blank, the following is shown in the console:
```
Uncaught n {name: "each", message: "undefined method `each' for nil", args: Array(0), stack: "each: undefined method `each' for nil"}
raise @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:30
method_missing @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:30
t @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:28
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
a @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:268
y.yield1 @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
each @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:34
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
t @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:268
y.yield1 @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
each @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:34
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
render_all_items @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:268
n @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:268
y.yieldX @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
run_child_block @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
a @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.yield1 @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
build @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
(anonymous) @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
render @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
Router @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:261
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
t @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:268
y.yieldX @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
run_child_block @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
a @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.yield1 @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
build @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
(anonymous) @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
render @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
Router @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:261
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
$ @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:268
instance_eval @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:30
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
r @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:260
y.yieldX @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
run_child_block @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
a @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.yield1 @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
build @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
(anonymous) @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
render @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
i @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:260
instance_eval @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:30
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
e @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
call @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:36
__hyperstack_component_rescue_wrapper @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
__hyperstack_component_select_wrappers @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
render @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:260
n @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:261
y.yieldX @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
run_child_block @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
a @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.yield1 @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
build @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
(anonymous) @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
render @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
t @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:261
y.yieldX @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
(anonymous) @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:47
observing @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:47
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
observing @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:47
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
_render_wrapper @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:261
__send__ @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:30
y.send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
send @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:29
render @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:259
_o @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:184
uo @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:184
To @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:184
hs @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
vs @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
r @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
A$ @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
invokeGuardedCallback @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
em @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:187
gs @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
Bs @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
js @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
Ks @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
de @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:182
zt @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:182
Xs @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
_e @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:182
jt @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:182
Show 73 more frames
backend.js:1 The above error occurred in the component:
in FilterList (created by DocsPage)
in div (created by DocsPage)
in div (created by DocsPage)
in div (created by DocsPage)
in div
in qi (created by DocsPage)
in div (created by DocsPage)
in DocsPage (created by $)
in $ (created by n)
in n (created by AppRouter)
in n (created by AppRouter)
in n (created by AppRouter)
in AppRouter (created by Hyperstack::Internal::Component::TopLevelRailsComponent)
in Hyperstack::Internal::Component::TopLevelRailsComponent

Consider adding an error boundary to your tree to customize error handling behavior.
Visit https://fb.me/react-error-boundaries to learn more about error boundaries.
r @ backend.js:1
Mo @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:184
qo @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:184
r.callback @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
aa @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:183
$a @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:183
zo @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:184
ls @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
r @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
A$ @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
invokeGuardedCallback @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
_s @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
Hs @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
Bs @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
js @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
Ks @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
de @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:182
zt @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:182
Xs @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185
_e @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:182
jt @ application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:182
application-80aaf14f6e973a3611f4fdd106f4b7608997f17f1d2951f763efb837b8ba8ef4.js:185 Uncaught n {name: "each", message: "undefined method `each' for nil", args: Array(0), stack: "each: undefined method `each' for nil"}
```
System: Chrome 76.0.3809.132 Linux