check content==null when Unpop

diff --git a/src/GraphicObjects/Popper.cs b/src/GraphicObjects/Popper.cs
index fdbed62cb4539fe76dbdc531d4bfc5ba7ce7c06f..5938fd8a51e45b4c448ad5771dc38fad0eeb0d85 100644 (file)
--- a/src/GraphicObjects/Popper.cs
+++ b/src/GraphicObjects/Popper.cs
@@ -189,7 +189,8 @@ namespace Crow
                {
                        if (Interface.CurrentInterface == null)
                                return;
-                       Content.Visible = false;
+                       if (Content != null)
+                               Content.Visible = false;
                        Unpop.Raise (this, e);
                }
        }