Getting error on editing polygon(Invalid LngLat object: (NaN, NaN))

Hi Team,
I added geojson polygon to map and i am trying to edit the polygon at this stage getting below error
Uncaught Error: Invalid LngLat object: (NaN, NaN)

case 2:
        {
            const lnglatall = figure.lnglatall,
                  coords = lnglatall.split('_');
            var ret = [], coord = [];
            coords.forEach(crd => 
            {
                if( crd.length > 0 )
                {
                    coord = crd.split(',');
                    ret.push(  [coord[1], coord[0]] );
                }                
            });            

            ret.push(ret[0]);

            figure_ = 
            {
                "id": figure.AutoIDx,
                "type": "Feature",
                "properties": {},
                "geometry": {
                    "type": "Polygon",
                    "coordinates": [
                         ret  
                    ],                
                }
            }          
            
            lon_to_fly = ret[0][0];
            lat_to_fly = ret[0][1];            

            break;
        }
      }      
     
      console.log(  figure_  )
      this.last_id_toEdit  = this.draw.add(  figure_ );
      this.draw.setFeatureProperty(this.last_id_toEdit, 'portColor', this.color_hex);

The polygon is drawn  on the map but when is editted throws the errot described.

Any help please?

Start by reproducing the polygon edit path around this.draw.add(figure_) and the conversion of figure.lnglatall into ret. Inspect the generated figure_ and coordinate values before editing; done means identifying the source of the NaN values and confirming that editing the polygon no longer throws the Invalid LngLat error.