v0.9.0, open the shortages tab, got:

The mod Item Network SA (0.9.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event item-network-sa::on_gui_selected_tab_changed (ID 164)
item-network-sa/src/GlobalState.lua:221: attempt to perform arithmetic on a nil value
stack traceback:
item-network-sa/src/GlobalState.lua:221: in function 'fluid_temp_key_decode'
item-network-sa/src/NetworkViewUi.lua:506: in function 'get_list_of_items'
item-network-sa/src/NetworkViewUi.lua:517: in function 'get_rows_of_items'
item-network-sa/src/NetworkViewUi.lua:259: in function 'update_items'
item-network-sa/src/UiHandlers.lua:302: in function 'handler'
item-network-sa/src/UiHandlers.lua:370: in function 'handle_generic_gui_event'
item-network-sa/src/NetworkChest.lua:1195: in function <item-network-sa/src/NetworkChest.lua:1194>

My bad — I accidentally added quality to fluids. I’ve added the fix to 0.9.1. Just don’t open the Shortages tab immediately. It needs a couple of seconds to clear out the old broken keys and replace them with the new ones. Wait about 2 seconds before opening the Shortages tab, and the crashes will be gone.