diff --git a/engine/tempotrack.py b/engine/tempotrack.py
index e6f7d55..b0ed774 100644
--- a/engine/tempotrack.py
+++ b/engine/tempotrack.py
@@ -244,11 +244,11 @@ class TempoBlock(GraphBlock):
         return oid
 
 class TempoTrack(GraphTrackCC):
-    """The Tempo Track is Laborejos own independent structure that sends data to 
+    """The Tempo Track is Laborejos own independent structure that sends data to
     template.sequencer.TempoMap which handles the actual midi/cbox tempo map.
-    
-    There is only one TempoTrack instance in the main data strucutre. """        
-    
+
+    There is only one TempoTrack instance in the main data strucutre. """
+
     def __init__(self, parentData):
         firstBlock = TempoBlock(parentGraphTrack = self)
         firstBlock.name = "Default Tempo"
@@ -302,7 +302,7 @@ class TempoTrack(GraphTrackCC):
     def splitTempoBlock(self, tempoBlockId, positionInTicksRelativeToBlock):
         """The new block will be right of the original content. If the new block will be empty
         or has no real start value the last prevailing tempo will be used
-        as the blocks start-point"""        
+        as the blocks start-point"""
         block = self.tempoBlockById(tempoBlockId)
         if not block.duration > positionInTicksRelativeToBlock:
             return False
@@ -426,15 +426,15 @@ class TempoTrack(GraphTrackCC):
 
     def _expandLastBlockToScoreDuration(self):
         """
-        The tempo tracks needs to be at least as long as the score. 
+        The tempo tracks needs to be at least as long as the score.
         We force it on every staticExport.
-        
+
         This can lead to unexpected behaviour if the last block is content-linked and will resize
         automatically when the score-duration gets longer. All the other content links will resize
         as well.
         We therefore define it to "expected behaviour" and put a note in the users
         manual to prevent that confusion"""
-        
+
         lastBlock = self.blocks[-1]
         plainScoreDuration = self.parentData.duration()
         duration = sum(block.duration for block in self.blocks)
@@ -570,9 +570,20 @@ class TempoTrack(GraphTrackCC):
                         "graphType" : thisGraphItem.graphType,
                         "lilypondParameters" : thisGraphItem.lilypondParameters,
                         }
-                    if additionalData: #additional data is not for interpolated items
-                        exportDictItem.update(additionalData)
+
+                    #There was a problem with this in nuitka 0.6.10 with py 3.9.
+                    #The full dict was evaluating to False.
+                    #Working around this was trivial, but let's hope that was not just one example of countless problems.
+                    #if additionalData: #additional data is not for interpolated items
+                    #    print ("found additional for", id(thisGraphItem), additionalData)
+                    #    exportDictItem.update(additionalData)
+                    #else:
+                    #    print ("found NO additional for", id(thisGraphItem), additionalData)
+                    #    if "referenceTicks" in additionalData:
+                    #        print ("refTicks in additional!", additionalData)
+                    exportDictItem.update(additionalData)  #updating with an empty dict is ok as well.
                     result.append(exportDictItem)
+
                     typeString = "interpolated" #The next items in userItemAndInterpolatedItemsPositions are interpolated items. Reset once we leave the local forLoop.
 
             #Prepare data for the next block.
@@ -596,7 +607,7 @@ class TempoTrack(GraphTrackCC):
         virtualLast.update(additionalData)
         #Add this to the result AFTER we calculate the midi data. Otherwise it will result in conflicts.
 
-        #send tempo information to cbox.        
+        #send tempo information to cbox.
         blocksAsDict = self.blocksAsDict()
         offsetForBlock = {}
 
@@ -605,7 +616,7 @@ class TempoTrack(GraphTrackCC):
             offsetForBlock[block] = offsetCounter
             offsetCounter += block.duration #after this block is over how many ticks have gone by?
 
-        
+
         sendToSequencerTempoMap = {}  #{positionInTicks:(bpmAsFloat, timesigUpper, timesigLower)}
         for staticItem in result: #static item is a tempo change as exportDictItem from above.
             value = float(abs(staticItem["value"])) #exportItems have negative values. calfbox wants a float.
@@ -613,7 +624,7 @@ class TempoTrack(GraphTrackCC):
             absoluteBlockStartPosition = offsetForBlock[tempoBlock]
             pos = staticItem["positionInBlock"] + absoluteBlockStartPosition
             sendToSequencerTempoMap[pos] = (value, 4, 4) #TODO: faked 4/4 meter because we do not combine tempo and timesig, but midi and jack wants to combine it.
-            
+
         self.parentData.tempoMap.setTempoMap(sendToSequencerTempoMap)
 
         result.append(virtualLast)
@@ -662,17 +673,17 @@ class TempoTrack(GraphTrackCC):
     @property
     def factor(self):
         return self.parentData.tempoMap.factor
-        
+
     def setFactor(self, factor:float):
         self.parentData.tempoMap.setFactor(factor)
 
     def staticTrackRepresentation(self):
-        result = {}    
+        result = {}
         mini, maxi = self.getMinimumAndMaximumValues()
         result["minimumAbsoluteTempoValue"] = mini
         result["maximumAbsoluteTempoValue"] = maxi
-        return result        
-       
+        return result
+
 
     def lilypond(self):
         """Based on the static export"""