diff --git a/vlsisapd/src/dtr/src/Techno.cpp b/vlsisapd/src/dtr/src/Techno.cpp
index b47ad9ec..665b15dd 100644
--- a/vlsisapd/src/dtr/src/Techno.cpp
+++ b/vlsisapd/src/dtr/src/Techno.cpp
@@ -74,22 +74,33 @@ Rule* Techno::getRule(Name name, Name layer1, Name layer2) {
         if ((rule->getName() == name) && (rule->getLayer1() == layer1) && (rule->getLayer2() == layer2))
             return rule;
     }
-    string error ("[ERROR] Could not find rule: ");
-    error += name.getString();
-    error += ".";
-    error += layer1.getString();
-    error += ".";
-    error += layer2.getString();
-    error += ".";
-    throw DTRException(error);
+    //string error ("[ERROR] Could not find rule: ");
+    //error += name.getString();
+    //error += ".";
+    //error += layer1.getString();
+    //error += ".";
+    //error += layer2.getString();
+    //error += ".";
+    //throw DTRException(error);
+    return NULL;
 }
 
 double Techno::getValue(Name name, Name layer1, Name layer2) {
-    return getRule(name, layer1, layer2)->getValue();
+    Rule* r =  getRule(name, layer1, layer2);
+    if(!r) {
+        string error = "[ERROR] Could not find rule: " + name.getString() + "." + layer1.getString() + "." + layer2.getString() + ".";
+        throw DTRException(error);
+    }
+    return r->getValue();
 }
 
 const string& Techno::getValueAsString(Name name, Name layer1, Name layer2) {
-    return getRule(name, layer1, layer2)->getValueAsString();
+    Rule* r =  getRule(name, layer1, layer2);
+    if(!r) {
+        string error = "[ERROR] Could not find rule: " + name.getString() + "." + layer1.getString() + "." + layer2.getString() + ".";
+        throw DTRException(error);
+    }
+    return r->getValueAsString();
 }
 
 Techno* Techno::readFromFile(const string filePath) {
diff --git a/vlsisapd/src/dtr/src/vlsisapd/dtr/Techno.h b/vlsisapd/src/dtr/src/vlsisapd/dtr/Techno.h
index a194d701..585b6bd2 100644
--- a/vlsisapd/src/dtr/src/vlsisapd/dtr/Techno.h
+++ b/vlsisapd/src/dtr/src/vlsisapd/dtr/Techno.h
@@ -28,6 +28,9 @@ class Techno {
     inline Name getUnit();
     inline std::vector<Rule*>&  getRules();
 
+    inline void setName(Name);
+    inline void setUnit(Name);
+
     Rule*  addRule (Name name, double value, Name ref, Name layer1=Name(""), Name layer2=Name(""));
     ARule* addARule(Name name, double value, Name ref, Name layer1         , Name layer2);
 
@@ -46,6 +49,9 @@ class Techno {
 inline Name Techno::getName() { return _name; };
 inline Name Techno::getUnit() { return _unit; };
 inline std::vector<Rule*>&  Techno::getRules()  { return _rules;  };
+
+inline void Techno::setName(Name name) { _name = name; };
+inline void Techno::setUnit(Name unit) { _unit = unit; };
     
 } // namespace DTR
 #endif