Assertion failed on expression: 'ptr->GetHideFlags () == m_RequiredHideFlags' UnityEditor.DockArea:OnGUI()

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Assertion failed on expression: ‘ptr->GetHideFlags () == m_RequiredHideFlags’
UnityEditor.DockArea:OnGUI()

Got that error on 5.5.0f3, it lets me play the game and clear it, but i get it again…

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