Canceling an Android build gives an "InvalidOperationException" error message

To reproduce:
- Open attached project and launch "test" scene
- In Build Settings, switch to Android platform
- While the progress bar is progressing, hit the Cancel button
- Observe the following error message in Console:

InvalidOperationException: Operation is not valid due to the current state of the object
System.Collections.Stack.Peek () (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Collections/Stack.cs:321)
UnityEngine.GUILayoutUtility.EndLayoutGroup () (at C:/BuildAgent/work/d63dfc6385190b60/artifacts/EditorGenerated/GUILayoutUtility.cs:223)
UnityEngine.GUILayout.EndHorizontal () (at C:/BuildAgent/work/d63dfc6385190b60/artifacts/EditorGenerated/GUILayout.cs:244)
UnityEditor.BuildPlayerWindow.ActiveBuildTargetsGUI () (at C:/BuildAgent/work/d63dfc6385190b60/Editor/Mono/BuildPlayerWindow.cs:1079)
UnityEditor.BuildPlayerWindow.OnGUI () (at C:/BuildAgent/work/d63dfc6385190b60/Editor/Mono/BuildPlayerWindow.cs:1171)
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-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
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-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/BuildAgent/work/d63dfc6385190b60/Editor/Mono/GUI/DockArea.cs:241)
UnityEditor.HostView.Invoke (System.String methodName) (at C:/BuildAgent/work/d63dfc6385190b60/Editor/Mono/GUI/DockArea.cs:234)
UnityEditor.HostView.OnGUI () (at C:/BuildAgent/work/d63dfc6385190b60/Editor/Mono/GUI/DockArea.cs:126)