46c46
<                 if (allseries[i].stack == s.stack)
---
>                 if (allseries[i].stack == s.stack && allseries[i].datapoints.points.length != 0 )
49c49
<             
---
> 			
54c54
<             if (s.stack == null)
---
>             if (s.stack == null || datapoints.points.length == 0)
56c56
< 
---
> 		
57a58
> 
60c61,91
< 
---
>             
>             // less points ? add points to match the previous serie
>             if ( other.datapoints.points.length > datapoints.points.length ) {
>             	var completedpoints = [];
>             	var w = 0, x = 0, y = 0, z = -1,
>             		ods = other.datapoints.points.length,
>             		ops = other.datapoints.pointsize,
>             		ds = datapoints.points.length,
>             		dps = datapoints.pointsize;
>             	for( x = 0; x < ods; x += ops ) {
>             		z = -1;
>             		for( y = 0; y < ds ; y += dps ) {
>             			if ( other.datapoints.points[x] == datapoints.points[y] ) {
>             				z = y;
>             				break;
>             			}
>             		}
>             		if ( z > -1 ) {
>             			for( w = 0; w < dps; ++w )
>             				completedpoints.push( datapoints.points[z + w] );
>             		}
>             		else {
>             			completedpoints.push( other.datapoints.points[x] );
> 						for( w = 1; w < ops; ++w )
> 							completedpoints.push( 0 );
>             		}
>             	}
>             	s.datapoints.points = completedpoints;
>             	datapoints.points = completedpoints;
>             }
> 	
89c120
<                     // for lines, we can't use the rest of the points
---
> 					// for lines, we can't use the rest of the points
135c166
<                     else { // px < qx
---
>                     else { // px < qx