Game keeps crashing when trying to use the mod on Vulcanus. Here's the error message that appears:

The mod P.U.M.P. (2.1.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event pump::on_gui_click (ID 1)
pump/constructor.lua:157: attempt to index field 'module_config' (a nil value)
stack traceback:
pump/constructor.lua:157: in function 'construct_entities'
pump/control.lua:143: in function 'resume_process_selected_area_with_this_mod'
pump/control.lua:25: in function <pump/control.lua:20>

I get this error on Nauvis and Vulcanus

The mod P.U.M.P. (2.1.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event pump::on_gui_click (ID 1)
pump/constructor.lua:157: attempt to index field 'module_config' (a nil value)
stack traceback:
pump/constructor.lua:157: in function 'construct_entities'
pump/control.lua:143: in function 'resume_process_selected_area_with_this_mod'
pump/control.lua:25: in function <pump/control.lua:20>

Error while running event pump::on_gui_click (ID 1)
pump/constructor.lua:157: attempt to index field 'module_config' (a nil value)
stack traceback:
pump/constructor.lua:157: in function 'construct_entities'
pump/control.lua:143: in function 'resume_process_selected_area_with_this_mod'
pump/control.lua:25: in function <pump/control.lua:20>

Same:
The mod P.U.M.P. (2.1.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event pump::on_gui_click (ID 1)
pump/constructor.lua:157: attempt to index field 'module_config' (a nil value)
stack traceback:
pump/constructor.lua:157: in function 'construct_entities'
pump/control.lua:143: in function 'resume_process_selected_area_with_this_mod'
pump/control.lua:25: in function <pump/control.lua:20>

Reverting to 2.1.5 fixes the issue.

Sorry about that; I failed to do the "final test before upload" that I usually do after some final tweaks and code cleanups.
I've uploaded 2.1.7 that should have this resolved.

Confirmed fixed. Thank you for the quick reply!