If xsl:number (with no value or select attribute) is called where there is no context item (for example within xsl:function) then a compile-time NullPointerException occurs.
A patch is being placed in Subversion on the 9.0 branch.
Logged In: YES user_id=251681 Originator: YES
Fixed in 9.1.0.1 and in 9.0.0.7 (which is SA-only)
Logged In: YES
user_id=251681
Originator: YES
Fixed in 9.1.0.1 and in 9.0.0.7 (which is SA-only)