diff --git a/geometry/rect2d.hpp b/geometry/rect2d.hpp
index 3f94f94207..0e4f5e09f2 100644
--- a/geometry/rect2d.hpp
+++ b/geometry/rect2d.hpp
@@ -82,6 +82,11 @@ namespace m2
       m_maxX = m_maxY = impl::min_max_value<T, IsSigned>().get_max();
     }
 
+    bool IsValid() const
+    {
+      return (m_minX <= m_maxX && m_minY <= m_maxY);
+    }
+
     void Add(m2::Point<T> const & p)
     {
       m_minX = min(p.x, m_minX);
diff --git a/yg/clipper.cpp b/yg/clipper.cpp
index 67e861de14..40a2de500d 100644
--- a/yg/clipper.cpp
+++ b/yg/clipper.cpp
@@ -84,6 +84,7 @@ namespace yg
       if (renderQueue())
         return;
 
+      ASSERT ( m_clipRect.IsValid(), (m_clipRect) );
       OGLCHECK(glScissor(m_clipRect.minX(), m_clipRect.minY(), m_clipRect.SizeX(), m_clipRect.SizeY()));
     }