Hello Dynamo Friends 
I want to make polylines out of the sketch lines of a slab.
I`m getting the error for the long black line on index 8.
So i tried to delete all other lines and test if that helps, and that actually did work:
Then i saw the problem are these 4 lines:
Because they get grouped with the long line as you can see in the first picture.
But they should not because they are not connected:
So the problem is the group.curves node, so what are my alternatives?
Happy about any help, thanks!
Kind Regards 
Ok, sorry, i got it, there is a tolerance of 0.1 in the code.
i changed it to 0.001 and it works now
#Copyright(c) 2015, Konrad Sobon
# @arch_laboratory, http://archi-lab.net
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
#The inputs to this node will be stored as a list in the IN variable.
dataEnteringNode = IN
inputCurves = IN[0]
#join/group curves function
def groupCurves(Line_List):
ignore_distance = 0.1 # Assume points this close or closer to each other are touching
Grouped_Lines = []
Queue = set()
while Line_List:
Shape = []
Queue.add(Line_List.pop()) # Move a line from the Line_List to our queue
while Queue:
Current_Line = Queue.pop()
Shape.append(Current_Line)
for Potential_Match in Line_List:
Points = (Potential_Match.StartPoint, Potential_Match.EndPoint)
for P1 in Points:
for P2 in (Current_Line.StartPoint, Current_Line.EndPoint):
distance = P1.DistanceTo(P2)
if distance <= ignore_distance:
Queue.add(Potential_Match)
Line_List = [item for item in Line_List if item not in Queue]
Grouped_Lines.append(Shape)
return Grouped_Lines
OUT = groupCurves(inputCurves)
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