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I am using Unity 2018.3.0f2 Personal.

What I often see, is this error:

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A PreviewRenderUtility was not clean up properly before assembly reloading which lead to leaking this scene in the Editor. This can be caused by not calling Cleanup() during the OnDisable of an Editor or an EditorWindow.
UnityEditor.PreviewRenderUtility:Finalize()

Whenever this happens, my editor starts lagging and stuttering so I have to re-open it.
Unfortunately, this happens during every single usage of Amplify Shader Editor.

When I clicked the "Material Properties"-Tab in ASE, I suddenly got a whole bunch of error messages and the UI was broken:

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NullReferenceException: Object reference not set to an instance of an object
AmplifyShaderEditor.MasterNode.ReorderList (System.Collections.Generic.List`1[AmplifyShaderEditor.PropertyNode]& nodes) (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Master/MasterNode.cs:717)
AmplifyShaderEditor.MasterNode.DrawMaterialInputs (UnityEngine.GUIStyle toolbarstyle, System.Boolean style) (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Master/MasterNode.cs:639)
AmplifyShaderEditor.StandardSurfaceOutputNode.DrawProperties () (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Master/StandardSurface.cs:935)
AmplifyShaderEditor.ParentNode.SafeDrawProperties () (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/ParentNode.cs:2200)
AmplifyShaderEditor.NodeParametersWindow.Draw (UnityEngine.Rect parentPosition, AmplifyShaderEditor.ParentNode selectedNode, UnityEngine.Vector2 mousePosition, System.Int32 mouseButtonId, System.Boolean hasKeyboardFocus) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/NodeParametersWindow.cs:146)
AmplifyShaderEditor.AmplifyShaderEditorWindow.OnGUI () (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:4358)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:342)
UnityEditor.HostView.Invoke (System.String methodName) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:336)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:310)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect, System.Boolean customBorder, System.Boolean floatingWindow, System.Boolean isBottomTab) (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:363)
UnityEditor.DockArea.OldOnGUI () (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:322)
UnityEngine.Experimental.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:266)
UnityEngine.Experimental.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:438)
UnityEngine.Experimental.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:421)
UnityEngine.Experimental.UIElements.IMGUIContainer.HandleEvent (UnityEngine.Experimental.UIElements.EventBase evt) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:401)
UnityEngine.Experimental.UIElements.EventDispatcher.ProcessEvent (UnityEngine.Experimental.UIElements.EventBase evt, UnityEngine.Experimental.UIElements.IPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:511)
UnityEngine.Experimental.UIElements.EventDispatcher.Dispatch (UnityEngine.Experimental.UIElements.EventBase evt, UnityEngine.Experimental.UIElements.IPanel panel, UnityEngine.Experimental.UIElements.DispatchMode dispatchMode) (at C:/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:307)
UnityEngine.Experimental.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.Experimental.UIElements.EventBase e, UnityEngine.Experimental.UIElements.DispatchMode dispatchMode) (at C:/buildslave/unity/build/Modules/UIElements/Panel.cs:176)
UnityEngine.Experimental.UIElements.UIElementsUtility.DoDispatch (UnityEngine.Experimental.UIElements.BaseVisualElementPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:245)
UnityEngine.Experimental.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:68)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)

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NullReferenceException: Object reference not set to an instance of an object
AmplifyShaderEditor.MasterNode+<>c__DisplayClass79_0.<DrawMaterialInputs>b__0 (UnityEngine.Rect rect, System.Int32 index, System.Boolean isActive, System.Boolean isFocused) (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Master/MasterNode.cs:629)
UnityEditorInternal.ReorderableList.DoListElements (UnityEngine.Rect listRect) (at C:/buildslave/unity/build/Editor/Mono/GUI/ReorderableList.cs:587)
UnityEditorInternal.ReorderableList.DoLayoutList () (at C:/buildslave/unity/build/Editor/Mono/GUI/ReorderableList.cs:394)
AmplifyShaderEditor.MasterNode.DrawMaterialInputs (UnityEngine.GUIStyle toolbarstyle, System.Boolean style) (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Master/MasterNode.cs:650)
AmplifyShaderEditor.StandardSurfaceOutputNode.DrawProperties () (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/Master/StandardSurface.cs:935)
AmplifyShaderEditor.ParentNode.SafeDrawProperties () (at Assets/AmplifyShaderEditor/Plugins/Editor/Nodes/ParentNode.cs:2200)
AmplifyShaderEditor.NodeParametersWindow.Draw (UnityEngine.Rect parentPosition, AmplifyShaderEditor.ParentNode selectedNode, UnityEngine.Vector2 mousePosition, System.Int32 mouseButtonId, System.Boolean hasKeyboardFocus) (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/NodeParametersWindow.cs:146)
AmplifyShaderEditor.AmplifyShaderEditorWindow.OnGUI () (at Assets/AmplifyShaderEditor/Plugins/Editor/Menu/AmplifyShaderEditorWindow.cs:4358)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <ac823e2bb42b41bda67924a45a0173c3>:0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:342)
UnityEditor.HostView.Invoke (System.String methodName) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:336)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:310)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect, System.Boolean customBorder, System.Boolean floatingWindow, System.Boolean isBottomTab) (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:363)
UnityEditor.DockArea.OldOnGUI () (at C:/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:322)
UnityEngine.Experimental.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:244)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)


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GUI Error: You are pushing more GUIClips than you are popping. Make sure they are balanced.
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Hello, thank you for getting in touch!

It's unfortunate that you've stumbled upon such issue, could you please make sure that you're using the latest ASE version available through our website?

Also, are you by any chance on MacOS?

If so, which version?