Not able to delete integration middle step

main.de44c16a.chunk.js:1 Uncaught (in promise) TypeError: Cannot assign to read only property '1' of object '[object Array]'
    at Array.splice (<anonymous>)
    at ie (main.de44c16a.chunk.js:1)
    at main.de44c16a.chunk.js:1
    at e.t.produce (2.88ebcb29.chunk.js:70)
    at removeStep (main.de44c16a.chunk.js:1)
    at main.de44c16a.chunk.js:1
    at l (2.88ebcb29.chunk.js:87)
    at Generator._invoke (2.88ebcb29.chunk.js:87)
    at Generator.forEach.e.<computed> [as next] (2.88ebcb29.chunk.js:87)
    at r (2.88ebcb29.chunk.js:16)

Uncaught (in promise) TypeError: 1 is read-only