Error Null on save

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On a fresh new install, every time when I add or edit a block and hit the save button get an error. The error message in "Null". No other error is recorded.
Attached a print screen with the error.
I tried a empty site install, and a full site install and the result is the same. On an empty site at the first block I insert got the error on save. However the block was saved in the database and if I refresh the page the block is in place. If I close the error window it send me back to the editing window, hitting save again will create a new instance of the block.
It doesn't matter what block I want to add or edit, the error is the same.

Thanks

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Status: New
Xabatar
Xabatar replied on at Permalink Reply
Xabatar
Solved: if you have X-FRAME-OPTIONS set to "DENY" in htaccess this error will persist.
It need to be changed to "SAMEORIGIN" in order to get rid of the error.
mlocati replied on at Permalink Reply
mlocati

concrete5 Environment Information

# concrete5 Version
Core Version - 8.4.0
Version Installed - 8.4.0
Database Version - 20180524000000

# concrete5 Packages
None

# concrete5 Overrides
None

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache

# Server API
fpm-fcgi

# PHP Version
7.0.30

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dba, dom, enchant, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, imap, intl, json, ldap, libxml, mbstring, mcrypt, mysqli, mysqlnd, odbc, openssl, pcre, PDO, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, pspell, Reflection, session, shmop, SimpleXML, snmp, soap, sockets, SPL, sqlite3, standard, sysvmsg, sysvsem, sysvshm, tidy, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 600
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 600
max_input_vars - 10000
memory_limit - 512M
post_max_size - 32M
sql.safe_mode - Off
upload_max_filesize - 150M
ldap.max_links - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36