Msg 537, Level 16, State 3, Procedure Recover_Truncated_Data_Proc, Line 113 Invalid length parameter passed to the LEFT or SUBSTRING function

Transact-SQL
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5

can you help me

issue on that line

Invalid length parameter passed to the LEFT or SUBSTRING function

SELECT [Page ID],

Substring([ParentObject],CHARINDEX('Slot', [ParentObject])+4, ABS(CHARINDEX('Offset', [ParentObject])-(CHARINDEX('Slot', [ParentObject])+4))) as [Slot ID]