VFX stops + error when graph closed

VFX stops when the graph is closed and recompile correctly when the graph is reopened

error:
Unity cannot compile the VisualEffectAsset at path "Assets/Samples/SmokePortal/VFX_Portal 1.vfx" because of the following exception:
System.ArgumentException: This method should not be called on a disabled block
  at UnityEditor.VFX.VFXCodeGenerator.BuildBlock (UnityEditor.VFX.VFXTaskCompiledData taskData, System.Collections.Generic.List`1[T] linkedEventOut, UnityEditor.VFX.VFXShaderWriter blockFunction, UnityEditor.VFX.VFXShaderWriter blockCallFunction, System.Collections.Generic.HashSet`1[T] blockDeclared, System.Collections.Generic.Dictionary`2[TKey,TValue] expressionToName, UnityEditor.VFX.VFXBlock block, System.Int32& blockIndex) [0x00360] in .\UnityRepoPackages\Packages\com.unity.visualeffectgraph\Editor\Compiler\VFXCodeGenerator.cs:974 
  at UnityEditor.VFX.VFXCodeGenerator.Build (UnityEditor.VFX.VFXContext context, UnityEditor.VFX.VFXTask task, System.String templatePath, UnityEditor.VFX.VFXCompilationMode compilationMode, UnityEditor.VFX.VFXTaskCompiledData taskData, System.Collections.Generic.HashSet`1[T] dependencies) [0x00319] in .\UnityRepoPackages\Packages\com.unity.visualeffectgraph\Editor\Compiler\VFXCodeGenerator.cs:611 
  at UnityEditor.VFX.VFXCodeGenerator.Build (UnityEditor.VFX.VFXContext context, UnityEditor.VFX.VFXTask task, UnityEditor.VFX.VFXCompilationMode compilationMode, UnityEditor.VFX.VFXTaskCompiledData taskData, System.Collections.Generic.HashSet`1[T] dependencies) [0x0001f] in .\UnityRepoPackages\Packages\com.unity.visualeffectgraph\Editor\Compiler\VFXCodeGenerator.cs:215 
  at UnityEditor.VFX.VFXGraphCompiledData.GenerateShaders (System.Collections.Generic.List`1[T] outGeneratedCodeData, UnityEditor.VFX.VFXExpressionGraph graph, System.Collections.Generic.IEnumerable`1[T] contexts, UnityEditor.VFX.VFXCompiledData compiledData, UnityEditor.VFX.VFXCompilationMode compilationMode, System.Collections.Generic.HashSet`1[T] dependencies) [0x00094] in .\UnityRepoPackages\Packages\com.unity.visualeffectgraph\Editor\Compiler\VFXGraphCompiledData.cs:832 
  at UnityEditor.VFX.VFXGraphCompiledData.Compile (UnityEditor.VFX.VFXCompilationMode compilationMode, System.Boolean forceShaderValidation) [0x00713] in .\UnityRepoPackages\Packages\com.unity.visualeffectgraph\Editor\Compiler\VFXGraphCompiledData.cs:1191 
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)