diff --git a/toMkdocs/gridTableTools.py b/toMkdocs/gridTableTools.py
index 7a71f5f0fb741db3b28c4d4022be8b6c2b90029e..f6825ae7c173f48e96da134ed4b2c38976067602 100644
--- a/toMkdocs/gridTableTools.py
+++ b/toMkdocs/gridTableTools.py
@@ -402,7 +402,7 @@ def parseGridTableWithSpans(gridTable:str) -> tuple[GridTableRowList, GridTableR
 						if len(cellsContent) <= numberOfColumns: # Colspan: Positions of | with respect to + need to be determined
 							columnCellIndex = 0
 
-							maxRowsTracker = max(rowsTracker)
+							maxRowsTracker = rowsTracker.max()
 							# Go through all cells in a columnt
 							for columnIndex, content in enumerate(cellsContent):
 								rowIndex = rowsTracker[columnCellIndex]