“I did upgrade to 5.5”
Like I said before that you should upgrade php version to 5.6 or higher:)
Joomla 3x itself requires php version 5.6 or 7.0 + (5.3 minimum), however, most extensions like Chronoform not really support good for old php version like 5.5 https://www.chronoengine.com/forums/posts/t103455/p367643#p367643
