History calendar of the record is shown blank/empty even when the history list exits.DescriptionHistory Calendar of the record is shown blank without any data even when the record has Audit and shows History -> List data.Release or EnvironmentAll ReleasesCauseWhen a record is inserted with null created(sys_created_on) value, The history calendar will be shown empty as below. Here is the way the issue can be reproduced. 1. Take any record which had data in History -> List (Right-click on the header of the record and History selection will be shown). 2. Check if it has History data. 3. Change sys_created_on value for this record as null.(Should be changed from backend in DB). 4. Now Right-click on the record once again and select History -> Calendar. 5. History calendar cannot be built with here is the Exception shown in the logs. 2020-06-11 04:52:14 (245) Default-thread-6 7CE3501A1B951010F3EFB99F1D4BCB61 txid=b066d8921b95 SEVERE *** ERROR *** java.lang.NullPointerExceptionjava.lang.NullPointerExceptionat java.util.Calendar.setTime(Calendar.java:1770)at com.glide.ui.jelly.tags.mergedata.HistoryTag2.setCalendarFields(HistoryTag2.java:384)at com.glide.ui.jelly.tags.mergedata.HistoryTag2.generateHeader(HistoryTag2.java:353)at com.glide.ui.jelly.tags.mergedata.HistoryTag2.outputHistory(HistoryTag2.java:140)at com.glide.ui.jelly.tags.mergedata.HistoryTag2.doTag(HistoryTag2.java:109)at org.apache.commons.jelly.impl.CustomTagScript.run(CustomTagScript.java:205)at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:146)at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:235)at com.glide.ui.jelly.tags.StaticFormTag.invokeBody(StaticFormTag.java:25)at com.glide.ui.jelly.tags.BaseStaticTag.doTag(BaseStaticTag.java:26) ResolutionSet sys_created_on value for the record to get the History ->Calendar showing data.