You will receive no errors, because this is a logical programming error created by the user.

Always think, what the insim need to check first.

In your case, why whould you check the player's speed before checking if the player is OnTrack.
Because you can only check the Speed of the player, if the player is OnTrack.

You are right, thank you.

Quote from Bass-Driver :

@RealistAdam.

Made a new small changes and tested it. The code below is working.
I've changed the 2 IF statements in a different order.

CASE "!jrr":

$X_Axis = getcurrentplayervar("X"); #X axis SpawnPoint
$Y_Axis = getcurrentplayervar("Y"); #Y axis SpawnPoint
$Z_Axis = getcurrentplayervar("Z"); #Z axis SpawnPoint
$Flags = 128; #Move/Reset car (128) else (0)
$Heading = 0; #Heading of the players car at Spawnpoint
$UCID = 0; #Connection's unique id (0 = host)
$PLID = getcurrentplayervar("PLID"); #Player's unique id
$JRRAction = 4;

IF(GetPlayerVar($userName,"OnTrack") == 1)
THEN
IF ( GetCurrentPlayerVar( "InstantSpeed" ) < 1 )
THEN
$Message = " ```fix\n (". GetCurrentPlayerVar("UserName").") aracını yeniledi. >> (". GetLapperVar ( "LongTime" ) .") ``` ";
$DiscordChannel = "1206604043112157214";
sendmessagetodiscord($DiscordChannel,$Message);
privMsg( GetCurrentPlayerVar("NickName") . " ^7Araç yenileme başarılı.");
joinrequest($X_Axis , $Y_Axis , $Z_Axis , $Flags ,$Heading , $UCID , $PLID ,$JRRAction); #Send Data to LFS
ELSE
privmsg("^3Command abort: Stop the car!");
ENDIF
ELSE
privmsg("^1You cannot use this command in spectatormode");
ENDIF
BREAK;

The incorrect order of IF statements can cause headaches.

Although the location of the ifs may not cause problems sometimes, it would be better to have the if order correctly for the priority of the operation, I agree with you here.