Free @_ before spawning a new thread (known old Perl bug) as an attempt to fix the unref scalars error
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@ -288,6 +288,7 @@ sub check_version {
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my %p = @_;
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Slic3r::debugf "Checking for updates...\n";
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@_ = ();
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threads->create(sub {
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my $ua = LWP::UserAgent->new;
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$ua->timeout(10);
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