I am also having the same problem with the latest download of Feng 3.1.2.2
The first issue is related to the object_types requires that the plugin_id not be null. As the plugin sqls begin to load data into the tables, a blank plugin_id is encountered and it crashes. I altered the primary script under public/install/installation/templates/sql/mysql_schema.php Line 145 to allow null values in plugin_id.
Reviewing the tables I notices that almost all entries have inserted records with null values except for three:
person, company, mail do have plugin ids.
Then lastly another error occurred:
Error while loading inital data for plugin 'workspaces'.Field 'path' doesn't have a default value
Regards,
AdamEntity