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Unknown command issue.

In ckeditor-iccexception-plugin/src/exceptionlist/plugin.js from line 53.

I assume that the command referring in following code is pulled from other plugin, therefore we should check if it exist, or if plugin is installed.

      afterInit: (editor) => {
        /*
         * Checking for undefined equation and exiting function works for me
         */
        if(editor.commands.equation === undefined) {
            return;
        }

        editor.commands.equation.contextSensitive = true
        editor.commands.equation.refresh = function(editor) {
          if (!editor) {
            return
          }

          const startElement = editor.getSelection().getStartElement()
          const path = new CKEDITOR.dom.elementPath(startElement)
          const element = path.lastElement && path.lastElement.getAscendant('div', true)

          if (!(element && (element.hasClass('list') || element.hasClass('exception')))) {
            this.setState(CKEDITOR.TRISTATE_DISABLED)
          } else {
            this.setState(CKEDITOR.TRISTATE_OFF)
          }

          editor.commands.equation.refresh()
        }
      }

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