Broken built-in zimbra account

[KorJek]

hi, guys.
Need your advices, so please help.
When I'm using zmprov command with username/pass from localconfig (by default) I'm getting error

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zimbra@mail:~$ zmprov gaa
[] WARN: Problem parsing XML - Fatal Error: Problem on line 1 of document : An invalid XML character (Unicode: 0x0) was found in the element content of the document.
ERROR: zclient.IO_ERROR (invoke unable to parse response: <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"/></soap:Header><soap:Body><soap:Fault><soap:Code><soap:Value>soap:Receiver</soap:Value></soap:Code><soap:Reason><soap:Text>system failure: java.lang.NumberFormatException: For input string: 34011292"</soap:Text></soap:Reason><soap:Detail><Error xmlns="urn:zimbra"><Code>service.FAILURE</Code><Trace>qtp509886383-11379:https://127.0.0.1:7071/service/admin/soap/AuthRequest:1466847048470:cf59f6267ab46c93</Trace></Error></soap:Detail></soap:Fault></soap:Body></soap:Envelope>, server: localhost) (cause: com.zimbra.common.soap.SoapParseException unable to parse response: <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"/></soap:Header><soap:Body><soap:Fault><soap:Code><soap:Value>soap:Receiver</soap:Value></soap:Code><soap:Reason><soap:Text>system failure: java.lang.NumberFormatException: For input string: 34011292"</soap:Text></soap:Reason><soap:Detail><Error xmlns="urn:zimbra"><Code>service.FAILURE</Code><Trace>qtp509886383-11379:https://127.0.0.1:7071/service/admin/soap/AuthRequest:1466847048470:cf59f6267ab46c93</Trace></Error></soap:Detail></soap:Fault></soap:Body></soap:Envelope>)

But when I specified anothe admin account - all is fine.
Grepping '34011292' through /opt/zimbra, I have found error in zmmailboxd.out

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2016-06-24 06:01:53.768:INFO:oejs.Server:main: Started @39698ms
log4j:ERROR No syslog host is set for SyslogAppedender named "SLOGGER".
Exception in thread "SyncGalGroup-1" java.lang.NumberFormatException: For input string: "^@^@^H^@^A34011292"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)

I'm frustrated where this values "^@^@^H^@^A34011292" is getting from, because using ldapsearch i can't find this value for acc zimbra (which is used from localconfig)

Please help identify what is wrong with built-in account.