diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index 96789defe2..1d3c55f1f9 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -3201,7 +3201,11 @@ void wxWindowGTK::DoClientToScreen( int *x, int *y ) const
         return;
     }
 
-    wxCHECK_RET(source, "ClientToScreen failed on unrealized window");
+    if (source == NULL)
+    {
+        wxLogDebug("ClientToScreen cannot work when toplevel window is not shown");
+        return;
+    }
 
     int org_x = 0;
     int org_y = 0;
@@ -3271,7 +3275,11 @@ void wxWindowGTK::DoScreenToClient( int *x, int *y ) const
         return;
     }
 
-    wxCHECK_RET(source, "ScreenToClient failed on unrealized window");
+    if (source == NULL)
+    {
+        wxLogDebug("ScreenToClient cannot work when toplevel window is not shown");
+        return;
+    }
 
     int org_x = 0;
     int org_y = 0;