Crash when deleting a field.

[pkshadygrove]

I was deleting a field and this happened:

1. Click the red delete button for a field
2. click Update
   OBSERVE: (see image below)

The system encountered a serious database error. This should not occur. Please report these details on github.

Class: FormTools\Fields
File: C:\wamp64\www\formtools\global\code\Fields.class.php
Line: 1540
Error: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1

[pkshadygrove]