[Security Solution][Endpoint] Fixes kibana crash when going back to policy details page (#164329)

dasansol92 · kibanamachine · dasansol92 · commit b7d86450bc56 · 2023-08-23T10:50:33.000Z
Fixes: #164295 Fixes: #164190 ## Summary There was a Kibana crash when using back link buttons to go back to the policy details page from Trusted Apps / Event Filters / Host Isolation exceptions / Blocklists page. Route state can be null depending on the previous action so it has to be conditional. The error occurs when it tries to access the `backLink` prop on `routeState` when it's not defined. Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com> (cherry picked from commit fb79e3e)
diff --git a/x-pack/plugins/security_solution/public/management/pages/policy/view/policy_details.tsx b/x-pack/plugins/security_solution/public/management/pages/policy/view/policy_details.tsx
@@ -60,7 +60,7 @@ export const PolicyDetails = React.memo(() => {
         },
       ],
     };
-  }, [getAppUrl, routeState.backLink]);
+  }, [getAppUrl, routeState?.backLink]);
 
   const headerRightContent = (
     <AgentsSummary
