Check if unit exists before trying to get it's position etc.

CTLD.lua

@@ -5482,6 +5482,7 @@ function ctld.laseUnit(_enemyUnit, _jtacUnit, _jtacGroupName, _laserCode)
 
     local _spots = {}
 
+    if _enemyUnit:isExist() then
         local _enemyVector = _enemyUnit:getPoint()
         local _enemyVectorUpdated = { x = _enemyVector.x, y = _enemyVector.y + 2.0, z = _enemyVector.z }
 
@@ -5554,6 +5555,7 @@ function ctld.laseUnit(_enemyUnit, _jtacUnit, _jtacGroupName, _laserCode)
                 _oldIR:setPoint(_enemyVectorUpdated)
             end
         end
+    end
 end
 
 -- get currently selected unit and check they're still in range