Index: trunk/src_plugins/lib_compat_help/pstk_compat.c
===================================================================
--- trunk/src_plugins/lib_compat_help/pstk_compat.c	(revision 38634)
+++ trunk/src_plugins/lib_compat_help/pstk_compat.c	(revision 38635)
@@ -168,12 +168,16 @@
 		if (compat_via_shape_gen(&copper_master, cshape, pad_dia) != 0)
 			return -1;
 
-		for(n = 0; n < 3; n++)
-			memcpy(&shape[n], &copper_master, sizeof(copper_master));
-		shape[0].layer_mask = PCB_LYT_COPPER | PCB_LYT_TOP;    shape[0].comb = 0;
-		shape[1].layer_mask = PCB_LYT_COPPER | PCB_LYT_BOTTOM; shape[1].comb = 0;
-		shape[2].layer_mask = PCB_LYT_COPPER | PCB_LYT_INTERN; shape[2].comb = 0;
-		tshp.len = 3;
+		if (pad_dia > 0) {
+			for(n = 0; n < 3; n++)
+				memcpy(&shape[n], &copper_master, sizeof(copper_master));
+			shape[0].layer_mask = PCB_LYT_COPPER | PCB_LYT_TOP;    shape[0].comb = 0;
+			shape[1].layer_mask = PCB_LYT_COPPER | PCB_LYT_BOTTOM; shape[1].comb = 0;
+			shape[2].layer_mask = PCB_LYT_COPPER | PCB_LYT_INTERN; shape[2].comb = 0;
+			tshp.len = 3;
+		}
+		else
+			tshp.len = 0; /* omit copper shapes if it's zero diameter */
 	}
 	else
 		tshp.len = 0;