sql - Invalid length parameter error -


i'm passing list of names ssrs sql server stored procedure i'm getting error:

invalid length parameter passed left or substring function

this code:

select substring(item, 1, len(item) - 36)  dbo.fnsplit(@manager, ',')

the reason substring remove 36 character guid attached end of manager name. names passed this:

    john smith, tom perry

i've read error caused spaces, can't figure out how fix this.

just use case:

select (case when len(item) <= 36 item              else left(item, len(item)-36)         end) dbo.fnsplit(@manager, ',')

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