diff --git a/src/de/dhbwstuttgart/typeinference/assumptions/TypeAssumptions.java b/src/de/dhbwstuttgart/typeinference/assumptions/TypeAssumptions.java
index 9fba5a92..f809a843 100755
--- a/src/de/dhbwstuttgart/typeinference/assumptions/TypeAssumptions.java
+++ b/src/de/dhbwstuttgart/typeinference/assumptions/TypeAssumptions.java
@@ -410,9 +410,10 @@ public class TypeAssumptions {
 	
 	public ClassAssumption getClassAssumptionFor(RefType t){
 		for(ClassAssumption cA : this.getClassAssumptions()){
-			if(cA.getAssumedClass().getType().equals(t))return cA;
+			RefType classType = cA.getAssumedClass().getType();
+			if(classType.get_Name().equals(t.get_Name()))return cA;
 		}
-		throw new TypeinferenceException("Der Typ "+t+" ist nicht in den Assumptions vorhanden", t);
+		throw new TypeinferenceException("Die Klasse für den Typ "+t+" ist nicht in den Assumptions vorhanden", t);
 	}
 
 	public Type checkType(RefType type, SyntaxTreeNode parent) {
diff --git a/test/bytecode/Matrix_lambda.jav b/test/bytecode/Matrix_lambda.jav
index 8b318125..293f776e 100644
--- a/test/bytecode/Matrix_lambda.jav
+++ b/test/bytecode/Matrix_lambda.jav
@@ -1,5 +1,5 @@
-import de.dhbwstuttgart.typeinference.Menge;
+import java.util.Vector;
 
-class Matrix extends Menge<Menge<Integer>> {
+class Matrix extends Vector<Vector<Integer>> {
 	op = (Matrix m) -> (f) -> f.apply(this, m); 
 } 
\ No newline at end of file
diff --git a/test/bytecode/Matrix_lambda2.jav b/test/bytecode/Matrix_lambda2.jav
new file mode 100644
index 00000000..f41dec6d
--- /dev/null
+++ b/test/bytecode/Matrix_lambda2.jav
@@ -0,0 +1,4 @@
+
+class Matrix  {
+	op = (f) -> f.apply(2); 
+} 
\ No newline at end of file
diff --git a/test/bytecode/Matrix_lambdaTest2.java b/test/bytecode/Matrix_lambdaTest2.java
new file mode 100644
index 00000000..aa6ec4fd
--- /dev/null
+++ b/test/bytecode/Matrix_lambdaTest2.java
@@ -0,0 +1,14 @@
+package bytecode;
+
+import org.junit.Test;
+
+public class Matrix_lambdaTest2 {
+	public final static String rootDirectory = System.getProperty("user.dir")+"/test/bytecode/";
+	public final static String testFile = "Matrix_lambda2.jav";
+	public final static String outputFile = "Matrix_lambda2.class";
+	
+	@Test
+	public void test() {
+		SingleClassTester.compileToBytecode(rootDirectory+testFile, rootDirectory+outputFile);
+	}
+}