Rescue Errno::EINVAL on IRB pp

http://rubyci.s3.amazonaws.com/solaris11-gcc/ruby-master/log/20210119T070008Z.log.html.gz
is caused by:

/export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/reline/ansi.rb:157:in `winsize': Invalid argument - <STDIN> (Errno::EINVAL)
        from /export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/reline/ansi.rb:157:in `get_screen_size'
        from /export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/reline.rb:168:in `get_screen_size'
        from /export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/forwardable.rb:238:in `get_screen_size'
        from /export/home/chkbuild/chkbuild-gcc/tmp/build/20210119T150010Z/ruby/lib/irb/color_printer.rb:7:in `pp'
        from -e:1:in `<main>'

lib/irb/color_printer.rb

@@ -4,11 +4,21 @@
 
 module IRB
   class ColorPrinter < ::PP
-    def self.pp(obj, out = $>, width = Reline.get_screen_size.last)
-      q = ColorPrinter.new(out, width)
-      q.guard_inspect_key {q.pp obj}
-      q.flush
-      out << "\n"
+    class << self
+      def pp(obj, out = $>, width = screen_width)
+        q = ColorPrinter.new(out, width)
+        q.guard_inspect_key {q.pp obj}
+        q.flush
+        out << "\n"
+      end
+
+      private
+
+      def screen_width
+        Reline.get_screen_size.last
+      rescue Errno::EINVAL # in `winsize': Invalid argument - <STDIN>
+        79
+      end
     end
 
     def text(str, width = nil)