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2 changes: 1 addition & 1 deletion src/Giraffe.ViewEngine/StringBuilderPool.fs
Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ type public StringBuilderPool =
let lifetime = DateTimeOffset.Now - StringBuilderPool.created
let expired = lifetime > PoolLimits.MaximumLifetime
let sb = StringBuilderPool.instance
if not expired && sb <> null then
if not expired && not (isNull sb) then
StringBuilderPool.instance <- null
sb.Clear()
else new StringBuilder(PoolLimits.MinimumCapacity)
Expand Down