End of script output before headers: index.php

@mipon wrote:

With Matomo 3.6.1, PHP 7.2, MySQL 5.7, the Apache error log is filled with the following error.

End of script output before headers: index.php, referer: https://.../index.php?module=CoreHome&action=index&date=today&period=day&idSite=6&updated=1
End of script output before headers: index.php, referer: https://.../index.php?module=CoreHome&action=index&date=today&period=day&idSite=6&updated=2
End of script output before headers: index.php, referer: https://.../index.php?module=CoreHome&action=index&idSite=1&period=day&date=yesterday

The query arguments vary. But it is always rooted in index.php of the Matomo installation directory.

Also, in dashboard, I always see this so I have to reload the page but at least one widget gives this, not sure if it is related.

Oops… there was a problem during the request. Maybe the server had a temporary issue, or maybe you requested a report with too much data. Please try again. If this error occurs repeatedly please contact your Matomo administrator for assistance. 

The index.php permission is set to 755. In the apcu section of phpinfo() looks like this.

APCu Support	Enabled
Version	5.1.11
APCu Debugging	Disabled
MMAP Support	Enabled
MMAP File Mask	no value
Serialization Support	php
Build Date	Sep 14 2018 11:24:15

Directive	Local Value	Master Value
apc.coredump_unmap	Off	Off
apc.enable_cli	Off	Off
apc.enabled	On	On
apc.entries_hint	4096	4096
apc.gc_ttl	3600	3600
apc.mmap_file_mask	no value	no value
apc.preload_path	no value	no value
apc.serializer	php	php
apc.shm_segments	1	1
apc.shm_size	32M	32M
apc.slam_defense	On	On
apc.smart	0	0
apc.ttl	0	0
apc.use_request_time	On	On
apc.writable	/tmp	/tmp

Where else should I look for the cause of the error?

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