Render problems

Ok this make me confused this shouldn't look like this

Update: the problem is not the plane, but the smoke emitter. If I disable the render of the smoke, it works

huh this must be a glitch. try this 

Update: the number of particles is too big, with less particle it works

(the number of particles is too big, with less particle it works) 

Well I think this should be not a thing but it is.

How many particles does it need in order to work ?

maybe your computer rendering system is not very good

ops the bullet was a mistake

My computer has an i7-8750H, 16G RAM, NVIDIA GTX 1050 4G

With 5000 particles works. With 7000 breaks. Same result with more than one emitter, the total must be not greater than 5000

Update: Disabling Motion Blur (Render Properties -> Motion Blur) I'am able to render 3 smoke emitter with 5000 particle each

Can you send me the  blend file

Google Drive link

see frame 188

and thanks!

Hey Fabio, can you see if this works for you (it renders fine now on my pc...):

https://drive.google.com/open?id=1JrSws4NRLMj5BpcomNl3LA_3h5w3N4zO

Hi, it works. Please, tell me what have you changed

O.k., first of all, you didn't do anything wrong, it's a bug. I think it has already been reported (at least an other bug that is probably the same issue). I don't know what is causing it, but I'm guessing that somewhere in the calculations of the Motion Blur, there is a division by the size or scale of the objects in the scene. When there are objects with size 0, that yields infinity and computers don't like that and start misbehaving;)

You used a Colorramp in the Texture to control the Size of the Particles. The Colorramp had a black flag, and black means 0.

Being a genius, I changed the Value of the black color from 0 to 0.0001.

That is all! No more dividing by 0 and therefor no more infinity! Computer happy, we happy.

Took me quite some time to figure it out though, so maybe I'm not that much of a genius after all...:(

OK, thank you very much. I'll never use zeros :-)

This was driving me crazy for ages too, I looked all over for possible answers, and bug reports, (motion blur seems to be causing many people issues! 😅) but your solution worked a treat! Thank you so much!