I noticed my timeline currently isn't working and found this error in the log

Anyone know the problem might be?

ERROR - Actor threw an exception
java.lang.StringIndexOutOfBoundsException: String index out of range: 20
        at java.lang.String.substring(String.java:1935)
        at 
org.apache.esme.model.Message$$anonfun$digestedXHTML$1$$anonfun$apply$13$$anonfun$apply$18$$anonfun$apply$19.apply(Message.scala:402)
        at 
org.apache.esme.model.Message$$anonfun$digestedXHTML$1$$anonfun$apply$13$$anonfun$apply$18$$anonfun$apply$19.apply(Message.scala:395)
        at scala.Option.map(Option.scala:70)
        at 
org.apache.esme.model.Message$$anonfun$digestedXHTML$1$$anonfun$apply$13$$anonfun$apply$18.apply(Message.scala:395)
        at 
org.apache.esme.model.Message$$anonfun$digestedXHTML$1$$anonfun$apply$13$$anonfun$apply$18.apply(Message.scala:394)
        at scala.Option.flatMap(Option.scala:77)
        at 
org.apache.esme.model.Message$$anonfun$digestedXHTML$1$$anonfun$apply$13.apply(Message.scala:394)
        at 
org.apache.esme.model.Message$$anonfun$digestedXHTML$1$$anonfun$apply$13.apply(Message.scala:381)
        at scala.Seq$class.map(Seq.scala:280)
        at scala.collection.mutable.ArrayBuffer.map(ArrayBuffer.scala:26)
        at 
org.apache.esme.model.Message$$anonfun$digestedXHTML$1.apply(Message.scala:381)
        at 
org.apache.esme.model.Message$$anonfun$digestedXHTML$1.apply(Message.scala:381)
        at scala.Seq$class.flatMap(Seq.scala:294)
        at scala.xml.NodeSeq.flatMap(NodeSeq.scala:34)
        at org.apache.esme.model.Message.digestedXHTML(Message.scala:381)
        at org.apache.esme.model.Message$text$.asJsExp(Message.scala:299)
        at org.apache.esme.model.Message$text$.asJsExp(Message.scala:296)
        at net.liftweb.mapper.BaseMappedField$class.asJs(MappedField.scala:196)
        at net.liftweb.mapper.MappedText.asJs(MappedBinary.scala:103)
        at 
net.liftweb.mapper.MetaMapper$$anonfun$46.apply(MetaMapper.scala:1248)
        at 
net.liftweb.mapper.MetaMapper$$anonfun$46.apply(MetaMapper.scala:1248)
        at scala.List.flatMap(List.scala:1132)
        at net.liftweb.mapper.MetaMapper$class.asJs(MetaMapper.scala:1248)
        at org.apache.esme.model.Message$.asJs(Message.scala:43)
        at net.liftweb.mapper.Mapper$class.asJs(Mapper.scala:127)
        at org.apache.esme.model.Message.asJs(Message.scala:282)
        at 
org.apache.esme.comet.Timeline$$anonfun$render$1.apply(Timeline.scala:69)
        at 
org.apache.esme.comet.Timeline$$anonfun$render$1.apply(Timeline.scala:68)
        at scala.List.map(List.scala:812)
        at org.apache.esme.comet.Timeline.render(Timeline.scala:68)

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