my game keep crashing when it get notification of something melted

Initial triage identifies that your infinite water storage causing something to go haywire in the sim when the mechanical door closes.

 

changed the infinite storage and it doesnt crash for now

i think with that design it accidentally become a liquid duplicator too, which answer my own question why the water got so much, and after a long time it can crash the game.
but i still dont understand why it get melted, that is why i dont consider the infinite storage to be the fault
thank you for the help!

Given that the next sim update after the second image the water with a quantity so vast it causes the string formatter to suffer integer overflow boils into steam at +infinity degrees kelvin (this is the point at which the sim actually crashes), I suspect there is a bug to be found in the code there, however as it is dealing with such outlier values It may be a while before investigating it is viable [though I am curious myself so I may fudge the priorities a bit to satiate the curiosity just don't tell anyone].

If we want to play the wild speculation / guess game, my suspicion is that the heat is coming from an attempt to preserve energy, that is when the door is closed in the sim what happens is some tiles of the doors material are created displacing the water, Speculation: the door tile is taking on the energy of the water it displaces (80c * ~100,000,000 kg of water at a shc of ~4 is a fair amount of energy) which would be why in the sim the door instantly becomes ~9000 degree kelvin iron gas, this temperature flakes the water in the tile below and nonsense ensues. I am just guessing though at this point.

The melting came from a floating point overflow, trying to compute the total energy involved in heat exchange between the door and the tile of water resulted in a value of roughly 8.2x10^38, the maximum [finite] value a 32 bit float can hold is 3.4x10^38, so this was rounded off to +infinity, which it turns out is quite hot no mater how you split it up.