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    Problem report 
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    Resolution: Fixed
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    Major 
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    3.4.1, 3.4.2
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        Sprint 17, Sprint 18, Sprint 19
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        0.5
I used Event correlation in ZABBIX for the verification work
I moved to the Dashboard, after confirming the operation of Monitoring Problems.
The attached image was displayed.
I edited the following and confirmed that the problem improved.
/usr/share/zabbix/app/views/monitoring.widget.problems.view.php
l.849 
before array_key_exists($problem['correlationid'], $data['correlations']) after TRUE == isset($data['correlations']) &&array_key_exists($problem['correlationid'], $data['correlations'])