Foreach does not perform IF statements

I've implemented foreach in one of the multiple for statements of my R code. It returns the main result (the one after all the iterations), however, it does not perform an IF statement within the code.

Below the skeleton of my code (it's too long to put everything).The if statement does not work and variable "Disc_Time" remains the same (as initialized). What I'm doing wrong or missing? I've tried with .export="f" and .export=ls(GlovalEnv) without success.

library(foreach)
library(doParallel)


cores=detectCores()
cl <- makeCluster(cores[1]-1) #not to overload your computer
registerDoParallel(cl)

Disc_Time<-c("UE","Beam_order","Time")
 .... MORE VARIABLES
MDP_x<-foreach (d = 1:length(dista),.combine='c')%dopar%
{

 for (q in 1:sim)
 {  
  for (ue in 1:n)
  {      
    for (i in 1:length(seq_order_BS))
    {
      for (j in 1:length(seq_order_UE))
      {
        if(first==0)
       {
         Disc_Time<-rbind(Disc_Time,c(ue,i,D_Time))               
       }

     }
   }
 }
}
 stopcluster(cl)