not able to set all settings in the customizer

[modellflieger]

When I'm opening the customizer, I get the following error in the browser console, and the settings tab of "general" and "styling" keeps empty...

fw-events.js?ver=2.7.31:156 ReferenceError: tinyMCEPreInit is not defined
at HTMLDivElement.init (scripts.js?ver=2.7.31:49:3)
at Function.each (jquery.min.js?ver=3.7.1:2:3129)
at e..each (jquery.min.js?ver=3.7.1:2:1594)
at scripts.js?ver=2.7.31:152:5
at dispatchSingleEvent (fw-events.js?ver=2.7.31:169:25)
at Array.map ()
at fw-events.js?ver=2.7.31:147:33
at objectMap (fw-events.js?ver=2.7.31:250:18)
at fwEvents.trigger (fw-events.js?ver=2.7.31:131:3)
at option-types.js?ver=2.7.31:3:12