diff --git a/lib/src/widgets/toolbar.dart b/lib/src/widgets/toolbar.dart
index 38bd8083..5efd20d7 100644
--- a/lib/src/widgets/toolbar.dart
+++ b/lib/src/widgets/toolbar.dart
@@ -199,14 +199,12 @@ class QuillToolbar extends StatelessWidget implements PreferredSizeWidget {
             ],
             onSelected: (newSize) {
               if (newSize == '0') {
+                controller
+                    .formatSelection(Attribute.fromKeyValue('size', null));
+              } else {
                 controller.formatSelection(
-                    Attribute.fromKeyValue('size', null));
+                    Attribute.fromKeyValue('size', getFontSize(newSize)));
               }
-              else
-                {
-                  controller.formatSelection(
-                      Attribute.fromKeyValue('size', getFontSize(newSize)));
-                }
             },
             rawItemsMap: fontSizes,
           ),