After updating to version 2.361.4 and updating plugins jenkins locks up with OOPS page and exception ID

In console log there is hollowing:

2023-06-29 18:12:03.075+0000 [id=58]    WARNING o.e.j.s.h.ContextHandler$Context#log: Error while serving https://jenkins.xxxxx.com/securityRealm/commenceLogin
java.lang.IllegalArgumentException: argument "content" is null
        at com.fasterxml.jackson.databind.ObjectMapper._assertNotNull(ObjectMapper.java:4829)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3596)
        at org.keycloak.util.JsonSerialization.readValue(JsonSerialization.java:75)
        at org.jenkinsci.plugins.KeycloakSecurityRealm.getKeycloakDeployment(KeycloakSecurityRealm.java:531)
        at org.jenkinsci.plugins.KeycloakSecurityRealm.doCommenceLogin(KeycloakSecurityRealm.java:194)
        at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:710)
        at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:397)
Caused: java.lang.reflect.InvocationTargetException
        at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:401)
        at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:409)
        at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:207)

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2023-06-29 18:12:03.077+0000 [id=58]    WARNING h.i.i.InstallUncaughtExceptionHandler#handleException: Caught unhandled exception with ID 1bbd6f07-be30-4b2e-b657-4acab0299e8c
java.lang.IllegalArgumentException: argument "content" is null
        at com.fasterxml.jackson.databind.ObjectMapper._assertNotNull(ObjectMapper.java:4829)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3596)
        at org.keycloak.util.JsonSerialization.readValue(JsonSerialization.java:75)
        at org.jenkinsci.plugins.KeycloakSecurityRealm.getKeycloakDeployment(KeycloakSecurityRealm.java:531)
        at org.jenkinsci.plugins.KeycloakSecurityRealm.doCommenceLogin(KeycloakSecurityRealm.java:194)
        at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:710)
        at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:397)
        at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:409)
        at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:207)
        at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:140)
        at org.kohsuke.stapler.MetaClass$11.doDispatch(MetaClass.java:558)
        at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:762)
Caused: javax.servlet.ServletException
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:812)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:894)
        at org.kohsuke.stapler.MetaClass$2.doDispatch(MetaClass.java:224)
        at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:762)