--- cui/source/tabpages/tpline.cxx	2019-12-05 20:59:23.000000000 +0100
+++ cui/source/tabpages/tpline.cxx	2020-03-17 22:06:49.493222000 +0100
@@ -491,7 +491,7 @@
             else if( m_pLineEndList->Count() > static_cast<long>( nPos - 1 ) )
                 pItem.reset(new XLineStartItem( m_xLbStartStyle->get_active_text(), m_pLineEndList->GetLineEnd( nPos - 1 )->GetLineEnd() ));
             pOld = GetOldItem( *rAttrs, XATTR_LINESTART );
-            if( pItem && ( !pOld || !( *static_cast<const XLineEndItem*>(pOld) == *pItem ) ) )
+            if( pItem && ( !pOld || *pOld != *pItem ) )
             {
                 rAttrs->Put( *pItem );
                 bModified = true;