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Crash when using time slider

See original GitHub issue

Someone on my server used the “import” function on an SVG file. This put the XML source in the document which screwed it up. Trying to revert, they opened the history. When sliding the slider, Etherpad crashes:

2018-04-08_21:39:49.94947 [2018-04-08 23:39:49.949] [ERROR] console - TypeError: Cannot read property 'substring' of undefined
2018-04-08_21:39:49.94951     at Object.insert (/opt/etherpad/6a38826/src/static/js/Changeset.js:794:45)
2018-04-08_21:39:49.94951     at Object.exports.mutateTextLines (/opt/etherpad/6a38826/src/static/js/Changeset.js:966:11)
2018-04-08_21:39:49.94952     at /opt/etherpad/6a38826/src/node/handler/PadMessageHandler.js:1519:19
2018-04-08_21:39:49.94953     at /opt/etherpad/6a38826/src/node_modules/async/lib/async.js:610:21
2018-04-08_21:39:49.94953     at /opt/etherpad/6a38826/src/node_modules/async/lib/async.js:249:17
2018-04-08_21:39:49.94954     at iterate (/opt/etherpad/6a38826/src/node_modules/async/lib/async.js:149:13)
2018-04-08_21:39:49.94954     at /opt/etherpad/6a38826/src/node_modules/async/lib/async.js:160:25
2018-04-08_21:39:49.94955     at /opt/etherpad/6a38826/src/node_modules/async/lib/async.js:251:21
2018-04-08_21:39:49.94956     at /opt/etherpad/6a38826/src/node_modules/async/lib/async.js:615:34
2018-04-08_21:39:49.94956     at /opt/etherpad/6a38826/src/node_modules/async/lib/async.js:254:17
2018-04-08_21:39:49.94957 [2018-04-08 23:39:49.949] [INFO] console - graceful shutdown...
2018-04-08_21:39:50.08340 [2018-04-08 23:39:50.083] [INFO] console - db sucessfully closed.

The server was not supervised by a supervisor so it remained dead. I didn’t start it again.

EPL version: 1.5.0 (89ad3cb809c9069325cebb30f67b887abf582028)