Pomodoro Clock: getting timer to run after a break and a pause

JavaScript
1

I have an onClick method attached to a button called “start_stop”, which calls handleTimer. If you click start_stop when handleTimer is running, it gets paused and only resumes when you click it back. When handleTimer ends, breakValueBegins. This works as intended. However, when I press start_stop when breakValueBegins is running, I can´t get it to start again. How could I do it?
I´m pasting both methods in their entirety, because I think that matters:

breakValueBegins() {
  clearInterval(this.Interval);
  let breakBegins=document.getElementById("timer-label");
  breakBegins.textContent="Good job! You get a break!";
  let breakBegan=this.state.breakBegan;
  let isPaused=this.state.isPaused;

  this.newInterval = setInterval(() => {
    let timer = this.state.timer;
   console.log(this.state.timer)
      if (timer > 0 && breakBegan && !isPaused) {
        this.setState({
          timer: this.state.timer -  1,
          isPaused: false
        })
      }

      else if(timer===0){
        clearInterval(this.newInterval);
        this.setState((state) => ({
        timer: this.state.session *60,
        breakValue: this.state.breakSession * 60,
        isPaused: true
      }));
      breakBegins.textContent="Session";
     this.handleTimer()   
      }
    }, 100)
}

handleTimer() {
  let breakBegan= this.state.breakBegan;
  let isPaused = this.state.isPaused;
  clearInterval(this.Interval);
  this.Interval = setInterval(() => {
    let timer = this.state.timer;
    console.log(timer);
    if (timer > 0 && !breakBegan) {
      this.setState({
        timer: this.state.timer - 1,
        isPaused: false
      })
    }
    if (!isPaused) {
      clearInterval(this.Interval);
      clearInterval(this.newInterval);
      this.setState((state) => ({
        isPaused: true,
        intervalBegan: true
      }))
    }
    if (timer === 0) {
   clearInterval(this.Interval);
   this.setState((state) => ({
   timer: this.state.breakSession * 60, isPaused: false, breakBegan: true}));
    this.breakValueBegins();  
    }
    else{
      clearInterval(this.setInterval)
    }
  }, 100)
}