diff --git a/src/config.cc b/src/config.cc
index 045d8130a..fc2940ab1 100644
--- a/src/config.cc
+++ b/src/config.cc
@@ -1157,8 +1157,10 @@ Class load()
 
   c.showingDictBarNames = ( root.namedItem( "showingDictBarNames" ).toElement().text() == "1" );
 
-  c.usingToolbarsIconSize =
-    ( static_cast< ToolbarsIconSize >( root.namedItem( "usingToolbarsIconSize" ).toElement().text().toInt() ) );
+  QDomNode usingToolbarsIconSize = root.namedItem( "usingToolbarsIconSize" );
+  if ( !usingToolbarsIconSize.isNull() ) {
+    c.usingToolbarsIconSize = static_cast< ToolbarsIconSize >( usingToolbarsIconSize.toElement().text().toInt() );
+  }
 
   if ( !root.namedItem( "historyExportPath" ).isNull() )
     c.historyExportPath = root.namedItem( "historyExportPath" ).toElement().text();