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diff -up cups-1.7.5/scheduler/colorman.c.dbus-unref cups-1.7.5/scheduler/colorman.c
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--- cups-1.7.5/scheduler/colorman.c.dbus-unref	2014-10-21 12:43:10.401299966 +0100
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+++ cups-1.7.5/scheduler/colorman.c	2014-10-21 12:43:12.870312593 +0100
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@@ -208,7 +208,9 @@ void
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 cupsdStopColor(void)
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 {
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 #if !defined(__APPLE__) && defined(HAVE_DBUS)
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-  dbus_connection_unref(colord_con);
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+  if (colord_con)
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+    dbus_connection_unref(colord_con);
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+
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   colord_con = NULL;
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 #endif /* !__APPLE__ && HAVE_DBUS */
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 }