--- GValue.xs	10 Jan 2008 09:50:05 +1100	1.22
+++ GValue.xs	23 Jun 2008 17:49:34 +1000	
@@ -244,7 +244,16 @@
                                                  FALSE);
 
 		case G_TYPE_PARAM:
-			return newSVGParamSpec (g_value_get_param (value));
+			/* can have NULL here fetching object properties of
+			   type G_TYPE_PARAM with no value set yet, or from
+			   ->get_default_value of such a property */
+			{
+				GParamSpec *ps = g_value_get_param (value);
+				if (ps == NULL)
+					return &PL_sv_undef;
+				else
+					return newSVGParamSpec (ps);
+			}
 
 		case G_TYPE_OBJECT:
 			return gperl_new_object (g_value_get_object (value), FALSE);