fixed possible NPE

src/main/java/plugins/adufour/protocols/gui/block/WorkFlowContainer.java

@@ -553,7 +553,7 @@ public class WorkFlowContainer extends JLayeredPane implements WorkFlowListener,
         }
 
         MainFrame.pasteSelection(embed, true);
-        
+
         workFlow.addBlock(embed.getBlockDescriptor());
     }
 
@@ -584,6 +584,9 @@ public class WorkFlowContainer extends JLayeredPane implements WorkFlowListener,
 
     public BlockPanel getBlockPanel(BlockDescriptor blockInfo)
     {
+        if (blockInfo == null)
+            return null;
+
         if (blockInfo.getBlock() == workFlow)
             return getParentPanel();
 

src/main/java/plugins/adufour/protocols/gui/block/WorkFlowPanel.java

@@ -311,6 +311,9 @@ public class WorkFlowPanel extends BlockPanel implements VarVisibilityListener
                     {
                         final BlockPanel ownerPanel = innerFlowPane.getBlockPanel(innerBlock);
 
+                        if (ownerPanel == null)
+                            return;
+
                         exposingLinks.put(variable, new RoundedSquareLine(WorkFlowPanel.this, ownerPanel, variable)
                         {
                             @Override
@@ -375,6 +378,9 @@ public class WorkFlowPanel extends BlockPanel implements VarVisibilityListener
                     {
                         final BlockPanel ownerPanel = innerFlowPane.getBlockPanel(innerBlock);
 
+                        if (ownerPanel == null)
+                            return;
+
                         exposingLinks.put(variable, new RoundedSquareLine(ownerPanel, WorkFlowPanel.this, variable)
                         {
                             @Override