我正在使用Tinymce wiris 编辑器添加方程式。但是点击按钮不起作用。我检查了控制台，它显示了这个错误
插件.min.js
plugin.min.js:3353 Uncaught DOMException: Failed to execute 'getRangeAt' on 'Selection': 0 is not a valid index.
at e.value (http://localhost:8080/equation/tinymce/plugins/tiny_mce_wiris/plugin.min.js:3353:117)
at e.value (http://localhost:8080/equation/tinymce/plugins/tiny_mce_wiris/plugin.min.js:3316:81)
at t.value (http://localhost:8080/equation/tinymce/plugins/tiny_mce_wiris/plugin.min.js:3564:22)
at t.value (http://localhost:8080/equation/tinymce/plugins/tiny_mce_wiris/plugin.min.js:3559:27)
at t.value (http://localhost:8080/equation/tinymce/plugins/tiny_mce_wiris/plugin.min.js:3760:51)
at e.value (http://localhost:8080/equation/tinymce/plugins/tiny_mce_wiris/plugin.min.js:2517:28)
at e.value (http://localhost:8080/equation/tinymce/plugins/tiny_mce_wiris/plugin.min.js:2812:72)
我检查了plugin.min.js文件。但在那里找不到任何问题。提前致谢