NullReferenceException: Object reference not set to an instance of an object
UnityEditor.AssetImporterInspector.get_targetTitle () (at C:/buildslave/unity/build/Editor/Mono/ImportSettings/AssetImporterInspector.cs:17)

Repro:
- Select more than one audio clip in Assets folder
- double-click on any sample in Inspector preview

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.AssetImporterInspector.get_targetTitle () (at C:/buildslave/unity/build/Editor/Mono/ImportSettings/AssetImporterInspector.cs:17)
UnityEditor.Editor.OnHeaderGUI () (at C:/buildslave/unity/build/Editor/Mono/Inspector/Editor.cs:361)
UnityEditor.Editor.DrawHeader () (at C:/buildslave/unity/build/Editor/Mono/Inspector/Editor.cs:354)
UnityEditor.InspectorWindow.DrawEditor (UnityEditor.Editor editor, Int32 editorIndex, Boolean rebuildOptimizedGUIBlock, System.Boolean& showImportedObjectBarNext, UnityEngine.Rect& importedObjectBarRect) (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1113)
UnityEditor.InspectorWindow.DrawEditors (UnityEditor.Editor[] editors) (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1028)
UnityEditor.InspectorWindow.OnGUI () (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:352)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)