exception on receiving an iq message

got the same just again, coccinella 0.96.20 binary downloded, running on Linux.

iqhook ::jlib::handle_entity_time failed: 1
can't use non-numeric string as operand of "-"
    while executing
"expr {($local - $gmt)/60}"
    (procedure "::jlib::handle_entity_time" line 24)
    invoked from within
"::jlib::handle_entity_time ::jlib::jlib1 <email address hidden>/Avalon {time {xmlns urn:xmpp:time} 1 {} {}} -from <email address hidden>/Avalon -id purple332250f2 -ty..."
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 $func [list $jlibname $from $subiq] $args"
can't use non-numeric string as operand of "-"
    while executing
"expr {($local - $gmt)/60}"
    (procedure "::jlib::handle_entity_time" line 24)
    invoked from within
"::jlib::handle_entity_time ::jlib::jlib1 <email address hidden>/Avalon {time {xmlns urn:xmpp:time} 1 {} {}} -from <email address hidden>/Avalon -id purple332250f2 -ty..."
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 $func [list $jlibname $from $subiq] $args"

other client pretends to be:
Adium 1.4.1 (libpurple 2.7.5)

actually found a way to reproduce the problem, afterwards easy to fix ;)
problem was probably introduced with the expr {} raid for the last version.

fixed with svn revision 2865.