Error when editing tags

[ajerman]

When I change existing tag on Zimbra Desktop I get folowing error code:

Failure communicating with remote server. Please try again later.
Debug message: system failure: java.lang.NullPointerException

Exception:

com.zimbra.common.soap.SoapFaultException: system failure: java.lang.NullPointerException
ExceptionId:qtp1286783232-4920:1569237363647:8d0cc37b60c0fc56
Code:service.FAILURE
at com.zimbra.common.soap.Soap12Protocol.soapFault(Soap12Protocol.java:88)
at com.zimbra.common.soap.SoapTransport.extractBodyElement(SoapTransport.java:354)
at com.zimbra.common.soap.SoapTransport.parseSoapResponse(SoapTransport.java:313)
at com.zimbra.common.soap.SoapHttpTransport.invoke(SoapHttpTransport.java:260)
at com.zimbra.common.soap.SoapHttpTransport.invoke(SoapHttpTransport.java:164)
at com.zimbra.common.soap.SoapTransport.invoke(SoapTransport.java:407)
at com.zimbra.common.soap.SoapTransport.invokeWithoutSession(SoapTransport.java:393)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMailbox.java:690)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMailbox.java:652)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMailbox.java:647)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMailbox.java:640)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMailbox.java:636)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMailbox.java:632)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMailbox.java:628)
at com.zimbra.cs.mailbox.PushChanges.sendRequest(PushChanges.java:574)
at com.zimbra.cs.mailbox.PushChanges.pushRequest(PushChanges.java:507)
at com.zimbra.cs.mailbox.PushChanges.syncTag(PushChanges.java:818)
at com.zimbra.cs.mailbox.PushChanges.sync(PushChanges.java:258)
at com.zimbra.cs.mailbox.PushChanges.sync(PushChanges.java:195)
at com.zimbra.cs.mailbox.MailboxSync.sync(MailboxSync.java:168)
at com.zimbra.cs.mailbox.ZcsMailbox.sync(ZcsMailbox.java:125)
at com.zimbra.cs.mailbox.ZcsMailbox.syncOnTimer(ZcsMailbox.java:106)
at com.zimbra.cs.mailbox.SyncMailbox$1.run(SyncMailbox.java:279)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
If issue persists please post description and debug information here.

When I do the same in browser, everything works ok.
Best regards,
Andrej