Unable to export space as HTML

Summary

When trying to export a space as HTML, it stucks in 0%.

Environment

1. Confluence 1000.801.1

Steps to Reproduce

1. Space tools > content tools > export > HTML (custom or normal)

Investigation Done

• Tried in different prod instances
• clog

  2017-01-06 12:52:39.924985500 2017-01-06 12:52:39,924 INFO [Caesium-1-1] [impl.schedule.caesium.SchedulerRunDetailsDao] addRunDetails Job 'flushEdgeIndexQueue' has run: RunDetailsImpl[startTime=1483735959917,runOutcome=SUCCESS,durationInMillis=7,message=]
  2017-01-06 12:52:50.911053500 2017-01-06 12:52:50,910 ERROR [Caesium-1-3] [velocity] logVelocityMessage Left side ($pageLevelComments.size()) of '>' operation has null value at com/atlassian/confluence/pages/Page.htmlexport.vm[line 61, column 53]
  2017-01-06 12:52:51.911664500 2017-01-06 12:52:51,911 ERROR [Caesium-1-3] [velocity] logVelocityMessage Left side ($pageLevelComments.size()) of '>' operation has null value at com/atlassian/confluence/pages/Page.htmlexport.vm[line 61, column 53]
  2017-01-06 12:52:51.913433500 2017-01-06 12:52:51,913 WARN [Caesium-1-3] [confluence.importexport.impl.AbstractRendererExporterImpl] exportResource There is no download resource manager to export the resource: /wiki/rest/documentConversion/latest/conversion/thumbnail/56820270/1
  2017-01-06 12:52:57.531243500 2017-01-06 12:52:57,530 ERROR [Caesium-1-3] [velocity] logVelocityMessage Left side ($pageLevelComments.size()) of '>' operation has null value at com/atlassian/confluence/pages/Page.htmlexport.vm[line 61, column 53]
  2017-01-06 12:52:59.987911500 2017-01-06 12:52:59,987 ERROR [Caesium-1-3] [velocity] logVelocityMessage Left side ($pageLevelComments.size()) of '>' operation has null value at com/atlassian/confluence/pages/Page.htmlexport.vm[line 61, column 53]
  2017-01-06 12:53:00.145715500 2017-01-06 12:53:00,145 ERROR [Caesium-1-3] [confluence.importexport.impl.AbstractRendererExporterImpl] exportResource Resource not found for export: /wiki/download/attachments/152536372/Bin%20Master%205000.png
  2017-01-06 12:53:04.814365500 2017-01-06 12:53:04,814 ERROR [Caesium-1-3] [velocity] logVelocityMessage Left side ($pageLevelComments.size()) of '>' operation has null value at com/atlassian/confluence/pages/Page.htmlexport.vm[line 61, column 53]
  2017-01-06 12:53:04.841080500 2017-01-06 12:53:04,840 ERROR [Caesium-1-3] [velocity] logVelocityMessage Left side ($pageLevelComments.size()) of '>' operation has null value at com/atlassian/confluence/pages/Page.htmlexport.vm[line 61, column 53]

Workaround

Export as PDF or XML