When i pickup items close to a chest by a miniloader i receive the following unrecoverable error

The mod Inserter Configuration (1.0.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Inserter_Config::inserter-config-drop-distance-adjust (ID 229)
real number expected got nan.
stack traceback:
[C]: in function 'newindex'
__Inserter_Config/control.lua:128: in function 'set_arm_positions'
Inserter_Config/control.lua:504: in function <Inserter_Config/control.lua:470>