NPE when showing group associated consensus calculation without sequence logos

Null pointer exceptions like :
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at jalview.analysis.AAFrequency.completeConsensus(AAFrequency.java:314)
at jalview.analysis.AAFrequency.completeConsensus(AAFrequency.java:240)
at jalview.datamodel.SequenceGroup._updateConsensusRow(SequenceGroup.java:598)
at jalview.datamodel.SequenceGroup.recalcConservation(SequenceGroup.java:521)
at jalview.viewmodel.AlignmentViewport.updateGroupAnnotationSettings(AlignmentViewport.java:1950)
at jalview.gui.AlignmentPanel.updateAnnotation(AlignmentPanel.java:1592)
at jalview.gui.AlignmentPanel.updateAnnotation(AlignmentPanel.java:1586)
at jalview.gui.AlignFrame.showGroupConsensus_actionPerformed(AlignFrame.java:5824)

appear when enabling group consensus annotation rows in development build.