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I ran into a null pointer dereference crash while trying to make a mod.

Steps to reproduce:

• Download the mod (attached to this post) and install it.
• Start a new game.
• Spawn some items:

  Code: Select all

  game.getplayer().getinventory(defines.inventory.playermain).insert{name="crash-trigger-entity", count=1}
  game.getplayer().getinventory(defines.inventory.playermain).insert{name="small-electric-pole", count=1}
  game.getplayer().getinventory(defines.inventory.playermain).insert{name="solar-panel", count=1}
  

• Place the electric pole. Place the solar panel and crash trigger entity within range of the electric pole.
• Right-click the electric pole.
• Crash!

Note: Despite what I called it, the crash-trigger-entity doesn't seem to directly cause the crash. An electric furnace-like entity is spawned when you place the crash-trigger-entity. If the electric furnace-like entity is not spawned, the crash does not occur.

Update: the crash is caused by the furnace-like entity not having a "placeable-player" or "placeable-neutral" flag.

Hello, I would like to try it, but the mod is missing

kovarex wrote:Hello, I would like to try it, but the mod is missing

Fixed!

After more investigation, the crash does not occur if the electric-furnace-like entity (called iMod-aquifer-pump-powersink) has either the "placeable-neutral" or "placeable-player" flag. Maybe the game is trying to access the "order" field, which is required by either of these flags, and which was not set before.

I tried it (I had to fix several 0.8.8 -> 0.9.x incompatibilities), but it doesn't crash now, so I guess it had been fixed on the way.

dont mind me, just a bit of digging here!

This issue still exists!

Related Links:
Post informing me about this bug: https://forums.factorio.com/forum/vie ... 210#p41242
My Help request (in Modding Help) and finally found solution: https://forums.factorio.com/forum/vie ... =25&t=5373

#reopen

~Markus