Cannot create client in Invoice Plane

Hi I have installed invoice plane on apache webserver. Whenever I go to Add Clients tab it shows error. I went into the apache logs and it is saying this

[Sat Sep 09 16:42:53.164850 2017] [:error] [pid 22860] [client 127.0.0.1:50208] PHP Fatal error:  Cannot use [] for reading in /var/www/html/ip/application/modules/custom_fields/models/Mdl_custom_fields.php on line 257, referer: http://127.0.0.1/ip/index.php/dashboard
[Sat Sep 09 16:42:53.338840 2017] [:error] [pid 22864] [client 127.0.0.1:50210] PHP Fatal error:  Cannot use [] for reading in /var/www/html/ip/application/modules/custom_fields/models/Mdl_custom_fields.php on line 257, referer: http://127.0.0.1/ip/index.php/dashboard
[Sat Sep 09 16:42:53.523903 2017] [core:notice] [pid 22522] AH00051: child pid 22860 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Sat Sep 09 16:42:53.524236 2017] [core:notice] [pid 22522] AH00051: child pid 22864 exit signal Segmentation fault (11), possible coredump in /etc/apache2

Can you guys help me out?

Reading the output, are you using any Custom Fields on your client page? If so, do yoru custom field names contain any special characters? Your log files are displaying a checkbox element in the output above.

Can you re-post your log files, enclosed within a “code” tag (select the code, then click on the the </> butto in the toolbar.) This should hopefully clarify the log file.

Enabling “debug logging” in the ipconfig.php file will also yield more detailed information to help resolve the problem.

Search the forum before posting a new thread! This is now the 4th post about his error! InvoicePlane 1.5.4 released