Why does the Divide by zero error encountered error appear?

Question

SQL

1) I start the procedure
2) The procedure at the end of the execution gives an error on the line with the code

SET @Gdpks_Daugiklis = @Gdpks_Svoris/@Gdpks_PusgaminioIseiga;

3) I checked that the procedure was completed to the end, that is, the code after this line also worked despite the error.
4) I checked the data that @Gdpks_PusgaminioIseiga takes before the line with the error - they are not equal to 0, the value is 1000.0002 or 999.01, and the like, but they are never equal to 0.
What could be the error and why, despite the error, the code was still executed anyway?

Answer 1

Will not "run anyway":

SET ARITHABORT ON 
SET ANSI WARNINGS OFF

Or the error will not appear:

SET @Gdpks_Daugiklis = @Gdpks_Svoris / NULLIF( @Gdpks_PusgaminioIseiga, 0 )