fixed null ref error

Assets/Prefabs/Connection.prefab

@@ -75,7 +75,7 @@ LineRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 10306, guid: 0000000000000000f000000000000000, type: 0}
+  - {fileID: 2100000, guid: 4a4408a7228b2cb49bce2208230bbd69, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -111,7 +111,7 @@ LineRenderer:
       m_Curve:
       - serializedVersion: 3
         time: 0
-        value: 0.3
+        value: 0.18
         inSlope: 0
         outSlope: 0
         tangentMode: 0
@@ -120,7 +120,7 @@ LineRenderer:
         outWeight: 0.33333334
       - serializedVersion: 3
         time: 1
-        value: 0.3
+        value: 0.18
         inSlope: 0
         outSlope: 0
         tangentMode: 0
@@ -132,8 +132,8 @@ LineRenderer:
       m_RotationOrder: 4
     colorGradient:
       serializedVersion: 2
-      key0: {r: 0.4627451, g: 0.4627451, b: 0.4627451, a: 1}
-      key1: {r: 0.4627451, g: 0.4627451, b: 0.4627451, a: 1}
+      key0: {r: 0.2, g: 0.2, b: 0.2, a: 1}
+      key1: {r: 0.2, g: 0.2, b: 0.2, a: 1}
       key2: {r: 0, g: 0, b: 0, a: 0}
       key3: {r: 0, g: 0, b: 0, a: 0}
       key4: {r: 0, g: 0, b: 0, a: 0}

Assets/Prefabs/Point.prefab

@@ -25,7 +25,7 @@ RectTransform:
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 1882714990603045140}
-  m_LocalRotation: {x: 0.067298695, y: -0.6646487, z: 0.06030975, w: 0.7416709}
+  m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
   m_LocalPosition: {x: 0, y: 0, z: 1.96}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_ConstrainProportionsScale: 0
@@ -60,7 +60,7 @@ MeshRenderer:
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
   m_Materials:
-  - {fileID: 2180264, guid: 8f586378b4e144a9851e7b34d9b748ee, type: 2}
+  - {fileID: -2723583854633709972, guid: e01dc04fc20642041aebeaef670ef411, type: 2}
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -104,8 +104,8 @@ MonoBehaviour:
       m_Calls: []
   m_text: 0
   m_isRightToLeft: 0
-  m_fontAsset: {fileID: 11400000, guid: 8f586378b4e144a9851e7b34d9b748ee, type: 2}
-  m_sharedMaterial: {fileID: 2180264, guid: 8f586378b4e144a9851e7b34d9b748ee, type: 2}
+  m_fontAsset: {fileID: 11400000, guid: e01dc04fc20642041aebeaef670ef411, type: 2}
+  m_sharedMaterial: {fileID: -2723583854633709972, guid: e01dc04fc20642041aebeaef670ef411, type: 2}
   m_fontSharedMaterials: []
   m_fontMaterial: {fileID: 0}
   m_fontMaterials: []

Assets/Scripts/GameManager.cs

@@ -115,7 +115,7 @@ public class GameManager : MonoBehaviour
     }
 
     public List<Node> GetNodes() => NodeParent.GetComponentsInChildren<Node>().ToList();
-    public List<Connection> GetConnections() => ConnectionParent.GetComponentsInChildren<Connection>().ToList();
+    public List<Connection> GetConnections() => ConnectionParent?.GetComponentsInChildren<Connection>().ToList() ?? new();
 
     public void ExecuteRoundEnd()
     {