diff --git a/src/proverifspec/ProVerifOutputAnalyzer.java b/src/proverifspec/ProVerifOutputAnalyzer.java
index 9f08b95f3963b64c897ec16249bab68b23788c7c..cfe3301e1da8086d14139840103d7d1e679fa31d 100644
--- a/src/proverifspec/ProVerifOutputAnalyzer.java
+++ b/src/proverifspec/ProVerifOutputAnalyzer.java
@@ -228,10 +228,13 @@ public class ProVerifOutputAnalyzer {
                         {
                             for (AvatarPragma pragma: pragmas)
                             {
-                                if (pragma instanceof AvatarPragmaSecret
-                                        && this.avatar2proverif.getTrueName(((AvatarPragmaSecret) pragma).getArg()).equals(attributeName))
+                                if (pragma instanceof AvatarPragmaSecret)
                                 {
-                                    this.results.put(pragma, result);
+                                    String trueName = this.avatar2proverif.getTrueName(((AvatarPragmaSecret) pragma).getArg());
+                                    if (trueName != null && trueName.equals(attributeName))
+                                    {
+                                        this.results.put(pragma, result);
+                                    }
                                 }
                             }
                         }
diff --git a/src/tmltranslator/toavatar/TML2Avatar.java b/src/tmltranslator/toavatar/TML2Avatar.java
index 846e24026abd8924db5cb7e4e7a1ef9bddbbea4c..385552838b2d4cedc79004c8900c52faec46e996 100644
--- a/src/tmltranslator/toavatar/TML2Avatar.java
+++ b/src/tmltranslator/toavatar/TML2Avatar.java
@@ -1081,11 +1081,14 @@ public class TML2Avatar {
 				sig=signalOutMap.get(ch.getName());
 			}
 			if (ch.checkConf){
-			if (!attrsToCheck.contains(getName(ch.getName())+"_chData")){
-				AvatarAttribute attr = new AvatarAttribute(getName(ch.getName())+"_chData", AvatarType.INTEGER, block, null);
-				attrsToCheck.add(getName(ch.getName())+"_chData");
-				avspec.addPragma(new AvatarPragmaSecret("#Confidentiality "+block.getName() + "."+ch.getName()+"_chData", ch.getReferenceObject(), attr));
-				}
+                            if (!attrsToCheck.contains(getName(ch.getName())+"_chData")){
+				AvatarAttribute attr = block.getAvatarAttributeWithName(getName(ch.getName())+"_chData");
+                                if (attr != null)
+                                {
+                                    attrsToCheck.add(getName(ch.getName())+"_chData");
+                                    avspec.addPragma(new AvatarPragmaSecret("#Confidentiality "+block.getName() + "."+ch.getName()+"_chData", ch.getReferenceObject(), attr));
+                                }
+                            }
 			}
 			if (ch.checkAuth){
 				if (block.getAvatarAttributeWithName(getName(ch.getName())+"_chData")==null){
diff --git a/src/ui/window/JDialogProverifVerification.java b/src/ui/window/JDialogProverifVerification.java
index 4cdfe6d0318966f0017720d885c355cbfdab990a..560a6aee915f271c589b261fd82f5582502b6c62 100644
--- a/src/ui/window/JDialogProverifVerification.java
+++ b/src/ui/window/JDialogProverifVerification.java
@@ -593,6 +593,7 @@ public class JDialogProverifVerification extends javax.swing.JDialog implements
             mode = STOPPED;
         } catch (Exception e) {
             mode = STOPPED;
+            throw e;
         }
 
 
@@ -678,7 +679,7 @@ public class JDialogProverifVerification extends javax.swing.JDialog implements
             curList.setSelectedIndex(row);
             this.menuItem.pragma = curList.getModel().getElementAt(row);
             this.menuItem.result = this.results.get(this.menuItem.pragma);
-            this.menuItem.setEnabled(this.menuItem.result.getTrace() != null);
+            this.menuItem.setEnabled(this.adp != null && this.menuItem.result.getTrace() != null);
             popup.show(e.getComponent(), e.getX(), e.getY());
         }
     }