diff --git a/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java b/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
index 70db967aa..c0fc93acf 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
@@ -453,14 +453,15 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 				}
 			}
 			if (isUndefinedPairSetSet(result)) {
-				Set<UnifyPair> abhSubst = result.stream().findFirst()
-							   .get()
-							   .stream()
+				Set<UnifyPair> abhSubst = result.stream()
+							   .map(b -> 
+							    b.stream()
 							   .map(x -> x.getAllSubstitutions())
+							   .reduce((y,z) -> { y.addAll(z); return y;}).get())
 							   .reduce((y,z) -> { y.addAll(z); return y;}).get();
 				Set<UnifyPair> durchschnitt = abhSubst.stream()
 						                              .filter(x -> a.contains(x))
-						                              .filter(y -> abhSubst.contains(y))
+						                              //.filter(y -> abhSubst.contains(y))
 						                              .collect(Collectors.toCollection(HashSet::new));
 				Set<PlaceholderType> vars = durchschnitt.stream().map(x -> (PlaceholderType)x.getLhsType()).collect(Collectors.toCollection(HashSet::new));
 				nextSetasList = nextSetasList.stream().filter(x -> {