diff --git a/common/js/plugins/ckeditor/ckeditor/plugins/rx_paste/plugin.js b/common/js/plugins/ckeditor/ckeditor/plugins/rx_paste/plugin.js
index cd8340e7b..a2c2a26be 100644
--- a/common/js/plugins/ckeditor/ckeditor/plugins/rx_paste/plugin.js
+++ b/common/js/plugins/ckeditor/ckeditor/plugins/rx_paste/plugin.js
@@ -33,7 +33,7 @@ CKEDITOR.plugins.add('rx_paste', {
 			}
 
 			// Check if the pasted data contains any files.
-			if (filesCount) {
+			if (filesCount && dataTransfer.isFileTransfer()) {
 				event.stop();
 				for (let i = 0; i < filesCount; i++) {
 					uploadFile(dataTransfer.getFile(i));