diff --git a/parsers/survex.py b/parsers/survex.py
index e5b2867..9443603 100644
--- a/parsers/survex.py
+++ b/parsers/survex.py
@@ -1489,6 +1489,7 @@ def LoadSurvexBlocks():
     # this next makes a block_object assciated with a file_object.path = SURVEX_TOPNAME
     survexblockroot = SurvexBlock(name=ROOTBLOCK, survexpath="", cave=None, survexfile=survexfileroot, 
             legsall=0, legslength=0.0)
+    # crashes here sometimes on MariaDB complaining that cave_id should not be null. But it should be.
     survexblockroot.save()
 
     print(' - Loading Survex Blocks...')