You can quickly go and save your work by copying the JSON Definition of your Userview out first. Builder Advanced Tools#JSONDefinition Then, reload the builder, get back to the same place to paste your definition earlier, press update and try to save again. See if the problem persists.

I've tried this option and the problem persist .. I'm still can insert New Category but can't insert new menu .. help

Trying to upgrade to higher version, but got error message :

INFO 05 Apr 2018 12:19:04 org.joget.workflow.model.service.WorkflowManagerImpl - Datasource bound to jwdb
SharkEngineManager -> Shark engine is being initialized ...
Unknown JDBC Driver Vendor for : null using default (Standard) instead
Shark -> shark engine initialization is finished, it lasted 2 [s]
Shark -> SharkExampleJSP ready and waiting ...
2018-04-05 12:19:06,751: (conn:212) Unknown system variable 'lower_case_table_names'
2018-04-05 12:19:07,336: (conn:212) Unknown system variable 'lower_case_table_names'
2018-04-05 12:19:07,758: (conn:212) Unknown system variable 'lower_case_table_names'
2018-04-05 12:19:08,948: (conn:212) Unknown system variable 'lower_case_table_names'

Caused by: java.sql.SQLException: (conn:232) Unknown system variable 'lower_case_table_names'

At the list report, i cannot click edit row item and get err msg "java.lang.NullPointerException"

This could be a problem with your MySQL version.. try running with a newer version of MySQL