Updated LineRenderer and UILIneConnector implementations to both be safer and include warning about placing a UILineRenderer at any other position than 0,0,0.

Runtime/Scripts/Primitives/UILineRenderer.cs

@@ -296,8 +296,6 @@ namespace UnityEngine.UI.Extensions
 					PopulateMesh (vh, pointsToDraw);
 				}
 			} 
-
-
         }
 
 		private UIVertex[] CreateLineCap(Vector2 start, Vector2 end, SegmentType type)
@@ -501,6 +499,10 @@ namespace UnityEngine.UI.Extensions
             {
 				m_points = new Vector2[1];
             }
+			if (transform.GetComponent<RectTransform>().position != Vector3.zero)
+			{
+				Debug.LogWarning("A Line Renderer component should be on a RectTransform positioned at (0,0,0), do not use in child Objects.\nFor best results, create separate RectTransforms as children of the canvas positioned at (0,0) for a UILineRenderer and do not move.");
+			}
         }
     }
 }

Runtime/Scripts/Utilities/UILineConnector.cs

@@ -40,6 +40,10 @@ namespace UnityEngine.UI.Extensions
                 bool updateLine = false;
                 for (int i = 0; i < transforms.Length; i++)
                 {
+                    if (transforms[i] == null)
+                    {
+                        continue;
+                    }
                     if (!updateLine && previousPositions[i] != transforms[i].position)
                     {
                         updateLine = true;
@@ -60,6 +64,10 @@ namespace UnityEngine.UI.Extensions
             // First, convert the pivot to worldspace
             for (int i = 0; i < transforms.Length; i++)
             {
+                if (transforms[i] == null)
+                {
+                    continue;
+                }
                 worldSpaces[i] = transforms[i].TransformPoint(thisPivot);
             }
 
@@ -83,6 +91,10 @@ namespace UnityEngine.UI.Extensions
             previousPositions = new Vector3[transforms.Length];
             for (int i = 0; i < transforms.Length; i++)
             {
+                if (transforms[i] == null)
+                {
+                    continue;
+                }
                 previousPositions[i] = transforms[i].position;
             }
         }