Error writing to database Debug: Column 'json_content' cannot be null

Moodle 3.1 on centos 7, mysql 5.7. Brand new installation of h5p. Is there something else I have to go and download in order for this plugin to work? I am able to navigate through the entire create activity functionality but when I go to save and display, I get the following error:

Default exception handler: Error writing to database Debug: Column 'json_content' cannot be null
INSERT INTO mdl_hvp (authors,changes,source,license,license_version,license_extras,author_comments,year_from,year_to,name,course,intro,introformat,json_content,embed_type,main_library_id,filtered,disable,timemodified,slug,timecreated) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
[array (
  0 => NULL,
  1 => NULL,
  2 => NULL,
  3 => NULL,
  4 => NULL,
  5 => NULL,
  6 => NULL,
  7 => NULL,
  8 => NULL,
  9 => 'sky',
  10 => '13072',
  11 => '',
  12 => '1',
  13 => NULL,
  14 => 'div',
  15 => '14',
  16 => '',
  17 => 0,
  18 => 1543615886,
  19 => '',
  20 => 1543615886,
)]