diff --git a/Scripts/BlendShape/BlendShapeMerger.cs b/Scripts/BlendShape/BlendShapeMerger.cs
index 1f45c82c8..8a8c514a3 100644
--- a/Scripts/BlendShape/BlendShapeMerger.cs
+++ b/Scripts/BlendShape/BlendShapeMerger.cs
@@ -258,7 +258,15 @@ namespace VRM
                     foreach (var y in x.MaterialValues)
                     {
                         // restore values
-                        m_materialMap[y.MaterialName].SetColor(y.ValueName, y.BaseValue);
+                        Material material;
+                        if(m_materialMap.TryGetValue(y.MaterialName, out material))
+                        {
+                            material.SetColor(y.ValueName, y.BaseValue);
+                        }
+                        else
+                        {
+                            Debug.LogWarningFormat("{0} not found", y.MaterialName);
+                        }
                     }
                 }
             }
diff --git a/Scripts/Format/VRMImporter.cs b/Scripts/Format/VRMImporter.cs
index e14aff88e..b81d5b596 100644
--- a/Scripts/Format/VRMImporter.cs
+++ b/Scripts/Format/VRMImporter.cs
@@ -183,14 +183,39 @@ namespace VRM
                             case 3: value.w = x.targetValue[3]; break;
                         }
                     }
-                    return new MaterialValueBinding
+
+                    var material = context.GetMaterials().FirstOrDefault(y => y.name == x.materialName);
+                    var propertyName = x.propertyName;
+                    if (x.propertyName.EndsWith("_ST_S")
+                    || x.propertyName.EndsWith("_ST_T"))
                     {
-                        MaterialName = x.materialName,
-                        ValueName = x.propertyName,
-                        TargetValue = value,
-                        BaseValue = context.GetMaterials().First(y => y.name == x.materialName).GetColor(x.propertyName),
-                    };
+                        propertyName = x.propertyName.Substring(0, x.propertyName.Length - 2);
+                    }
+
+                    var binding = default(MaterialValueBinding?);
+
+                    if (material != null)
+                    {
+                        try
+                        {
+                            binding = new MaterialValueBinding
+                            {
+                                MaterialName = x.materialName,
+                                ValueName = x.propertyName,
+                                TargetValue = value,
+                                BaseValue = material.GetColor(propertyName),
+                            };
+                        }
+                        catch(Exception)
+                        {
+                            // do nothing
+                        }
+                    }
+
+                    return binding;
                 })
+                .Where(x => x.HasValue)
+                .Select(x => x.Value)
                 .ToArray();
             }