It did not provide any valid error but only below dump.
Cause
java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)
Stack Trace:[hide]
java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)
at com.google.common.collect.ImmutableList$Builder.add(ImmutableList.java:583)
at com.google.common.collect.ImmutableList$Builder.add(ImmutableList.java:566)
at com.google.common.collect.ImmutableCollection$Builder.addAll(ImmutableCollection.java:324)
at com.google.common.collect.ImmutableList$Builder.addAll(ImmutableList.java:600)
at com.atlassian.confluence.api.model.pagination.PageResponseImpl$Builder.addAll(PageResponseImpl.java:163)
at com.atlassian.confluence.api.model.pagination.PageResponseImpl.from(PageResponseImpl.java:79)
at com.atlassian.confluence.api.impl.pagination.PaginationServiceImpl.executeBatch(PaginationServiceImpl.java:169)
at com.atlassian.confluence.api.impl.pagination.PaginationServiceImpl.lambda$doRequestInTransaction$2(PaginationServiceImpl.java:153)
at com.atlassian.confluence.api.impl.ReadOnlyAndReadWriteTransactionConversionTemplate.lambda$executeInReadOnly$0(ReadOnlyAndReadWriteTransactionConversionTemplate.java:46)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
at com.atlassian.confluence.api.impl.ReadOnlyAndReadWriteTransactionConversionTemplate.executeInReadOnly(ReadOnlyAndReadWriteTransactionConversionTemplate.java:46)
at com.atlassian.confluence.api.impl.pagination.PaginationServiceImpl.doRequestInTransaction(PaginationServiceImpl.java:138)
at com.atlassian.confluence.api.impl.pagination.PaginationServiceImpl.doPaginationListRequest(PaginationServiceImpl.java:70)
at com.atlassian.confluence.internal.user.UserSearchServiceInternalImpl.doUserSearch(UserSearchServiceInternalImpl.java:70)
at com.atlassian.confluence.user.actions.AbstractSearchCrowdUsersAction.doUserSearch(AbstractSearchCrowdUsersAction.java:98)
at com.atlassian.confluence.user.actions.BrowseUsersAction.execute(BrowseUsersAction.java:9)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.core.ConfluenceLicenseInterceptor.intercept(ConfluenceLicenseInterceptor.java:66)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.validation.MessageHolderInterceptor.intercept(MessageHolderInterceptor.java:37)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
Maybe this is your problem: https://confluence.atlassian.com/confkb/confluence-triggers-npe-when-a-user-tries-to-open-view-all-users-802597745.html
But I think you better ask Atlassian Support:
https://support.atlassian.com/contact/
since this is a user forum, not officially Atlassian Support.
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