diff --git a/AssetStudioUtility/ModelConverter.cs b/AssetStudioUtility/ModelConverter.cs
index b36586a..7acf0db 100644
--- a/AssetStudioUtility/ModelConverter.cs
+++ b/AssetStudioUtility/ModelConverter.cs
@@ -92,11 +92,14 @@ namespace AssetStudio
             }
             else
             {
+                if (animationList != null)
+                {
                 foreach (var animationClip in animationList)
                 {
                     animationClipHashSet.Add(animationClip);
                 }
             }
+            }
             ConvertAnimations();
         }