Always get errors during upgrade (web interface)

Past couple of versions of NC - I always get an error 2-3 times when I try the updater via the web interface.
Error occurs at Backup stage.
Error message is terribly formatted (==unreadable)

Parsing response failed. html{height:100%}body{margin:0 auto;min-height:600px;min-width:800px;height:100%}.top{height:100px;height:calc(40% - 140px)}.bottom{height:150px;height:calc(60% - 210px)}.center{height:350px;text-align:center;vertical-align:middle;font-family:Verdana}.circle{margin:auto;width:260px;height:260px;border-radius:50%;background:#c0c6cc}.circle_text{line-height:260px;font-size:100px;color:#ffffff;font-weight:bold}.text{line-height:40px;font-size:26px;color:#505a64}

504

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