.

common/Drawings/WorkEvents.js

@@ -308,6 +308,8 @@
 		var lockedElement = null;
 
 		var newSender = (e.srcElement) ? e.srcElement : e.target;
+		if (!newSender)
+		    newSender = { id : "emulation_oo_id" };
 
 		if (global_mouseEvent.Sender && global_mouseEvent.Sender.id == newSender.id)
 		{

word/Drawing/HtmlPage.js

@@ -2046,6 +2046,9 @@ function CEditorPage(api)
 			oWordControl.m_oScrollHorApi.evt_mouseup(__e);
 		}
 
+		if (window.g_asc_plugins)
+            window.g_asc_plugins.onExternalMouseUp();
+
 		global_mouseEvent.Sender = null;
 
 		global_mouseEvent.UnLockMouse();