diff --git a/apps/presentationeditor/mobile/src/controller/edit/EditText.jsx b/apps/presentationeditor/mobile/src/controller/edit/EditText.jsx
index 2b9ce3ae1..e7879a3d8 100644
--- a/apps/presentationeditor/mobile/src/controller/edit/EditText.jsx
+++ b/apps/presentationeditor/mobile/src/controller/edit/EditText.jsx
@@ -198,9 +198,9 @@ class EditTextController extends Component {
         let spacing = curSpacing;
 
         if (isDecrement) {
-            spacing = (spacing === null || spacing === undefined) ? 0 : Math.max(-100, --spacing);
+            spacing = (spacing === null || spacing === undefined || spacing === NaN) ? 0 : Math.max(-100, --spacing);
         } else {
-            spacing = (spacing === null || spacing === undefined) ? 0 : Math.min(100, ++spacing);
+            spacing = (spacing === null || spacing === undefined || spacing === NaN) ? 0 : Math.min(100, ++spacing);
         }
     
         const properties = new Asc.asc_CParagraphProperty();
diff --git a/apps/presentationeditor/mobile/src/view/edit/EditText.jsx b/apps/presentationeditor/mobile/src/view/edit/EditText.jsx
index 5d8b636f8..bddc3defa 100644
--- a/apps/presentationeditor/mobile/src/view/edit/EditText.jsx
+++ b/apps/presentationeditor/mobile/src/view/edit/EditText.jsx
@@ -327,13 +327,13 @@ const PageAdditionalFormatting = props => {
             </List>
             <List>
                 <ListItem title={_t.textLetterSpacing}>
-                    {!isAndroid && <div slot='after-start'>{letterSpacing + ' ' + Common.Utils.Metric.getCurrentMetricName()}</div>}
+                    {!isAndroid && <div slot='after-start'>{Number(letterSpacing).toFixed(2) + ' ' + Common.Utils.Metric.getCurrentMetricName()}</div>}
                     <div slot='after'>
                         <Segmented>
                             <Button outline className='decrement item-link' onClick={() => {props.changeLetterSpacing(letterSpacing, true)}}>
                                 {isAndroid ? <Icon icon="icon-expand-down"></Icon> : ' - '}
                             </Button>
-                            {isAndroid && <label>{letterSpacing + ' ' + Common.Utils.Metric.getCurrentMetricName()}</label>}
+                            {isAndroid && <label>{Number(letterSpacing).toFixed(2) + ' ' + Common.Utils.Metric.getCurrentMetricName()}</label>}
                             <Button outline className='increment item-link' onClick={() => {props.changeLetterSpacing(letterSpacing, false)}}>
                                 {isAndroid ? <Icon icon="icon-expand-up"></Icon> : ' + '}
                             </Button>