From 27f08248fa2471dab6bce315387b9617fcfeb1ea Mon Sep 17 00:00:00 2001
From: Jussi Koskela <jussi.koskela@semantum.fi>
Date: Wed, 7 Nov 2018 15:52:57 +0200
Subject: [PATCH] Don't assume that Element provides TerminalTopology

(cherry picked from commit c0940268d6e3551f5c700d677073bf754ce8eaad)
---
 .../src/org/simantics/g2d/element/ElementUtils.java         | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/element/ElementUtils.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/element/ElementUtils.java
index 300e74d31..465db5e93 100644
--- a/bundles/org.simantics.g2d/src/org/simantics/g2d/element/ElementUtils.java
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/element/ElementUtils.java
@@ -258,8 +258,10 @@ public class ElementUtils {
     public static Collection<Terminal> getTerminals(IElement e, Collection<Terminal> result, boolean clearResult) {
         if (clearResult)
             result.clear();
-        TerminalTopology tt = e.getElementClass().getSingleItem(TerminalTopology.class);
-        tt.getTerminals(e, result);
+        TerminalTopology tt = e.getElementClass().getAtMostOneItemOfClass(TerminalTopology.class);
+        if (tt != null) {
+            tt.getTerminals(e, result);
+        }
         return result;
     }
 
-- 
2.43.2