3.6.30 breaks all forms due to undefined “el”

3.6.30 also broke my form with the following error:

Uncaught TypeError: this.input_limit.trim is not a function
    at Object.maybeInputLimit (fieldItem.js:219:1)
    at eval (eval at template (underscore.min.js?ver=1.13.4:2:15198), <anonymous>:13:14)
    at e (underscore.min.js?ver=1.13.4:2:15271)
    at Object.renderElement (fieldItem.js:116:1)
    at eval (eval at template (underscore.min.js?ver=1.13.4:2:15198), <anonymous>:32:14)
    at e (underscore.min.js?ver=1.13.4:2:15271)
    at Marionette.Renderer.render (main.js:58:1)
    at n._renderTemplate (front-end-deps.js?ver=3.6.30:20:22925)
    at n.render (front-end-deps.js?ver=3.6.30:20:22571)
    at Jn (underscore.min.js?ver=1.13.4:2:7441)

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