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-rw-r--r--lib/python/Components/Converter/FrontendInfo.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/python/Components/Converter/FrontendInfo.py b/lib/python/Components/Converter/FrontendInfo.py
index 35588027..796ac330 100644
--- a/lib/python/Components/Converter/FrontendInfo.py
+++ b/lib/python/Components/Converter/FrontendInfo.py
@@ -92,7 +92,8 @@ class FrontendInfo(Converter, object):
return 2
return -1
elif self.type == self.SLOT_NUMBER:
- return self.source.slot_number or -1
+ num = self.source.slot_number
+ return num is None and -1 or num
range = 65536
value = property(getValue)