I got this same error also. I opened "Aquarium_0.1.9.zip" and edited the file "\Aquarium-master\control.lua" and haven't seen the error since. The changes I made are as follows:
Changed line 25 from:
if f and f.name == "fish-water" and f.amount > 0.99 then
To:
if f and f.name == "fish-water" and f.amount >= 1 then
Changed line 33 from:
while amount > 0.99 do
To:
while amount >= 1 do
Inserted the following 3 lines as an error-check/trap (this is probably an unnecessary step) after line 35:
if amount < 0 then
amount = 0
end
Just for clarification, the entire "ticker = function(event)" section (Lines 14 through 54 inclusive) now looks like this:
ticker = function(event)
if event.tick % 120 == 0 then
if not global.ents or #global.ents == 0 then
-- rehash table just in cases - the extra s is for 'sausage'
if global.ents then global.ents = {} end
script.on_event(defines.events.on_tick, nil)
else
for i, ent in next, global.ents do
if ent.e and ent.e.valid and ent.e.fluidbox then
for k = 1, #ent.e.fluidbox do
local f = ent.e.fluidbox[k]
if f and f.name == "fish-water" and f.amount >= 1 then
local amount = f.amount
local tiles = ent.e.surface.get_connected_tiles(ent.pos, acceptableLivingConditions)
if type(tiles) ~= "table" or #tiles == 0 then
game.print({"fishyfishyfishy.wtf"})
table.remove(global.ents, i)
ent.e.destroy()
else
while amount >= 1 do
PUTFISHLOL(ent.e.surface, tiles)
amount = amount - 1
if amount < 0 then
amount = 0
end
end
f.amount = math.max(amount, 0)
ent.e.fluidbox[k] = f
break
end
end
end
else
-- Yes, we skip out early if we remove mid-table. #care
table.remove(global.ents, i)
end
end
end
end
end
end
