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Breaks totally when trying to find the responsible committer

See original GitHub issue

It seems I have a job with some strange history on my Jenkins, which wasn’t a problem before updating to 1.12+build.201809061734 (from 1.12+build.201805070054). The build monitor only shows an error dialog and the background AJAX requests fails with this:

[...]
        Caused by: org.codehaus.jackson.map.JsonMappingException: hudson.model.FreeStyleBuild cannot be cast to org.jenkinsci.plugins.workflow.job.WorkflowRun (through reference chain: com.smartcodelt
d.jenkinsci.plugins.buildmonitor.api.Success["data"]->java.util.ArrayList[43])
                at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218)
                at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:197)
                at org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:166)
                at org.codehaus.jackson.map.ser.std.StdContainerSerializers$IndexedListSerializer.serializeContents(StdContainerSerializers.java:127)
                at org.codehaus.jackson.map.ser.std.StdContainerSerializers$IndexedListSerializer.serializeContents(StdContainerSerializers.java:71)
                at org.codehaus.jackson.map.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:86)
                at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
                at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
                at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
                at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
                at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
                at org.codehaus.jackson.map.ObjectMapper._configAndWriteValue(ObjectMapper.java:2575)
                at org.codehaus.jackson.map.ObjectMapper.writeValueAsString(ObjectMapper.java:2097)
                at com.smartcodeltd.jenkinsci.plugins.buildmonitor.api.Respond.withSuccess(Respond.java:15)
                at com.smartcodeltd.jenkinsci.plugins.buildmonitor.BuildMonitorView.fetchJobViews(BuildMonitorView.java:142)
                at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
[...]

I know this is a data problem, but probably there can also be a check in the build-monitor for this.