Logging Error: IconBuild.php#101


if got a lot of Errors in the NextCloud log after a fresh Installation:
mime_content_type(): Failed identify data 0:invalid type 0 in mconvert() at /share/MD0_DATA/.qpkg/NextCloud/nextcloud/apps/theming/lib/IconBuilder.php#101

Can anybody help me here, i cant find anything about this error on google.

Nextcloud version (eg, 10.0.2): 10.0.2
Operating system and version (eg, Ubuntu 16.04): QNAP NAS
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.25
PHP version (eg, 5.6): 7.1.1
Is this the first time you’ve seen this error?: Yes after new Install

Can you reliably replicate it? (If so, please outline steps): The Error comes every vew seconds in the log

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

‘dbtype’ => ‘sqlite3’,
‘version’ => ‘’,
‘logtimezone’ => ‘GMT’,
‘installed’ => true,
‘theme’ => ‘’,
‘loglevel’ => 2,
‘maintenance’ => false,
‘memcache.local’ => ‘\OC\Memcache\APCu’,

Did you install all required php modules?

So far i can see yes,

core mod_so http_core event mod_authn_file mod_authn_dbm mod_authn_anon mod_authn_dbd mod_authn_socache mod_authn_core mod_authz_host mod_authz_groupfile mod_authz_user mod_authz_dbm mod_authz_owner mod_authz_dbd mod_authz_core mod_authnz_ldap mod_authnz_fcgi mod_access_compat mod_auth_basic mod_auth_form mod_auth_digest mod_allowmethods mod_isapi mod_file_cache mod_cache mod_cache_disk mod_cache_socache mod_socache_shmcb mod_socache_dbm mod_socache_memcache mod_socache_dc mod_watchdog mod_macro mod_dbd mod_bucketeer mod_dumpio mod_echo mod_example_hooks mod_case_filter mod_case_filter_in mod_example_ipc mod_buffer mod_data mod_ratelimit mod_reqtimeout mod_ext_filter mod_request mod_include mod_filter mod_reflector mod_substitute mod_sed mod_charset_lite mod_deflate mod_xml2enc mod_proxy_html mod_mime util_ldap mod_log_config mod_log_debug mod_log_forensic mod_logio mod_env mod_mime_magic mod_cern_meta mod_expires mod_headers mod_ident mod_usertrack mod_unique_id mod_setenvif mod_version mod_remoteip mod_proxy mod_proxy_connect mod_proxy_ftp mod_proxy_http mod_proxy_fcgi mod_proxy_scgi mod_proxy_fdpass mod_proxy_wstunnel mod_proxy_ajp mod_proxy_balancer mod_proxy_express mod_proxy_hcheck mod_session mod_session_cookie mod_session_crypto mod_session_dbd mod_slotmem_shm mod_slotmem_plain mod_ssl mod_optional_hook_export mod_optional_hook_import mod_optional_fn_import mod_optional_fn_export mod_dialup mod_http2 mod_proxy_http2 mod_lbmethod_byrequests mod_lbmethod_bytraffic mod_lbmethod_bybusyness mod_lbmethod_heartbeat mod_unixd mod_heartbeat mod_heartmonitor mod_dav mod_status mod_autoindex mod_asis mod_info mod_suexec mod_cgid mod_dav_fs mod_dav_lock mod_vhost_alias mod_negotiation mod_dir mod_imagemap mod_actions mod_speling mod_userdir mod_alias mod_rewrite mod_php7 mod_dav_svn mod_authz_svn

I thin kis hase somthing to do with the imagick modul but this is loaded too.