Uncaught ReferenceError: tinyMCE is not defined, plugin error

On my WP multisite I have a plugin that days ago it did work but not now, indeed on dashboard when I press the form button “save settings”, from chrome console I get “Uncaught ReferenceError: tinyMCE is not defined”.
Ok so the problem could be another plugin that interferes with this one and the possible solution could be deactivate all plugins and reactivate one by one until find out which one interferes…but it’s a good solution? Is there a possibilty to simply adjust the plugin that doesn’t work instead of deactivate others?
these are my errors:

t.getFormParams
    (anonymous function)
    m.event
    r.handle

and this is the reference for the admin.js?ver=1.5.4:836 error of t.getFormParams:

case "editor":
					if(tinyMCE.get(name) != null){
						value = tinyMCE.get(name).getContent();
					}
				break;

and the admin.js?ver=1.5.4:1187 referencec for the (anonymous function) error:

var data = {
				name: jQuery.trim(jQuery('input[name="name"]').val()),
				handle: jQuery.trim(jQuery('input[name="handle"]').val()), //is alias
				postparams: t.getFormParams('eg-form-create-posts'),
				params: t.getFormParams('eg-form-create-settings')
			};

Is there someone who can guide me to solve and understand what’s the problem and how to fix it? How could I define tinymce? How to search into the php code of the plugin?

p.s.
I don’t understand the t.getFormParams error I got, cause I’m the administrator.