From 2cbfa65a09eff1190e5db1d9cfc1979a448cbe31 Mon Sep 17 00:00:00 2001
From: Gavin Whelan <gavwhela@gmail.com>
Date: Mon, 27 Aug 2018 16:10:36 +0000
Subject: [PATCH] Fix exception in hpgl_encoder.py when encoding files with
 unicode in layer names.

---
 share/extensions/hpgl_encoder.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/share/extensions/hpgl_encoder.py b/share/extensions/hpgl_encoder.py
index d9a15ef36e..eb9a49e0ee 100644
--- a/share/extensions/hpgl_encoder.py
+++ b/share/extensions/hpgl_encoder.py
@@ -235,7 +235,10 @@ class hpglEncoder:
                 self.processPath(node[1], node[2], node[3])
 
     def getPenNumber(self, doc):
-        penNum = str(doc.get('{' + inkex.NSS['inkscape'] + '}label')).lower().strip(' \t\n\r')
+        penNum = doc.get('{' + inkex.NSS['inkscape'] + '}label')
+        if penNum == None:
+            return self.options.pen
+        penNum = penNum.lower().strip(' \t\n\r')
         if re.search(r'( |\A)pen *\d+( |\Z)', penNum):
             penNum = re.sub(r'(.* |\A)pen *(\d+)( .*|\Z)', r'\2', penNum, 1)
             return int(penNum)
-- 
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