CHG: bug fix

Author: farthinker

bower.json

@@ -1,6 +1,6 @@
 {
   "name": "simditor",
-  "version": "2.3.20",
+  "version": "2.3.21",
   "homepage": "http://simditor.tower.im/",
   "authors": [
     "farthinker <[email protected]>"

lib/simditor.js

@@ -1,7 +1,7 @@
 /*!
-* Simditor v2.3.20
+* Simditor v2.3.21
 * http://simditor.tower.im/
-* 2018-08-23
+* 2018-10-17
 */
 (function (root, factory) {
   if (typeof define === 'function' && define.amd) {
@@ -3157,7 +3157,7 @@ Popover = (function(superClass) {
     }
     this.el.siblings('.simditor-popover').each(function(i, popover) {
       popover = $(popover).data('popover');
-      if (popover.active) {
+      if (popover && popover.active) {
         return popover.hide();
       }
     });
@@ -4489,7 +4489,7 @@ ImageButton = (function(superClass) {
         return;
       }
       $img = $mask.data('img');
-      if (!($img.hasClass('uploading') && $img.parent().length > 0)) {
+      if (!($img && $img.hasClass('uploading') && $img.parent().length > 0)) {
         $mask.remove();
         return;
       }