Any idea how to resolve this error?

Error running system event handling function for resource fs_freemode: citizen:/scripting/lua/scheduler.lua:41: Failed to execute thread: server.lua:109: attempt to index a boolean value (local 'freemodeuser')
stack traceback:
server.lua:109: in upvalue 'callback'
libs/db.lua:62: in local 'userCallback'
citizen:/scripting/lua/scheduler.lua:274: in upvalue 'handler'
citizen:/scripting/lua/scheduler.lua:175: in function <citizen:/scripting/lua/scheduler.lua:174>
stack traceback:
[C]: in function 'error'
citizen:/scripting/lua/scheduler.lua:41: in field 'CreateThreadNow'
citizen:/scripting/lua/scheduler.lua:174: in function <citizen:/scripting/lua/scheduler.lua:138>
Error running system event handling function for resource fs_freemode: citizen:/scripting/lua/scheduler.lua:41: Failed to execute thread: server.lua:109: attempt to index a boolean value (local 'freemodeuser')
stack traceback:
server.lua:109: in upvalue 'callback'
libs/db.lua:62: in local 'userCallback'
citizen:/scripting/lua/scheduler.lua:274: in upvalue 'handler'
citizen:/scripting/lua/scheduler.lua:175: in function <citizen:/scripting/lua/scheduler.lua:174>
stack traceback:
[C]: in function 'error'
citizen:/scripting/lua/scheduler.lua:41: in field 'CreateThreadNow'
citizen:/scripting/lua/scheduler.lua:174: in function <citizen:/scripting/lua/scheduler.lua:138>

Any help would be much appreciated!