[Ubuntu] Animation creation error

When I select any gameObject and open the Animation window, and create a new animation file, I get this error in the console :

InvalidOperationException: Operation is not valid due to the current state of the object
System.Collections.Stack.Pop () (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Collections/Stack.cs:329)
UnityEngine.GUILayoutUtility.EndLayoutGroup () (at /home/builduser/buildslave/unity/build/artifacts/generated/common/runtime/GUILayoutUtilityBindings.gen.cs:222)
UnityEditor.SplitterGUILayout.EndHorizontalSplit () (at /home/builduser/buildslave/unity/build/Editor/Mono/GUI/Splitter.cs:496)
UnityEditor.AnimEditor.OnBreadcrumbGUI (UnityEditor.EditorWindow parent, Rect position) (at /home/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimEditor.cs:116)
UnityEditor.AnimationWindow.OnGUI () (at /home/builduser/buildslave/unity/build/Editor/Mono/Animation/AnimationWindow/AnimationWindow.cs:47)
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)

I cant create any new animations because of this. Please advise!
Build Version : 5.1.0f3+2015091501_amd64