diff --git a/out/production/TriangleCheckerAssignment/TriangleChecker.class b/out/production/TriangleCheckerAssignment/TriangleChecker.class
index 6b8e2e0..d21dd02 100644
Binary files a/out/production/TriangleCheckerAssignment/TriangleChecker.class and b/out/production/TriangleCheckerAssignment/TriangleChecker.class differ
diff --git a/out/test/TriangleCheckerAssignment/TriangleCheckerTest.class b/out/test/TriangleCheckerAssignment/TriangleCheckerTest.class
index c3fc8d1..1aae986 100644
Binary files a/out/test/TriangleCheckerAssignment/TriangleCheckerTest.class and b/out/test/TriangleCheckerAssignment/TriangleCheckerTest.class differ
diff --git a/src/TriangleChecker.java b/src/TriangleChecker.java
index 1b7691e..ca28825 100644
--- a/src/TriangleChecker.java
+++ b/src/TriangleChecker.java
@@ -48,7 +48,7 @@ public class TriangleChecker {
   // Analyse der Dreiecksart
   public static TriangleType checkTriangle(float a, float b, float c) {
 
-    if(a >= (b+c) || c >= (b+a) || b >= (a+c) ){
+    if(a >= (b+c) || c >= (b+a) || b >= (a+c) || a<=0 || b<=0 || c<=0){
 
       return TriangleType.NONE;
     }
diff --git a/test/TriangleCheckerTest.java b/test/TriangleCheckerTest.java
index dd4eaf2..e7761d0 100644
--- a/test/TriangleCheckerTest.java
+++ b/test/TriangleCheckerTest.java
@@ -37,4 +37,21 @@ public class TriangleCheckerTest {
 
     }
 
+    @Test
+    public void testNoTriangle() {
+
+        // Arrange
+        float a = -1;
+        float b = 2;
+        float c = -1;
+
+        // Act
+        TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);
+
+        // Assert
+        assertEquals(TriangleChecker.TriangleType.NONE, type);
+
+
+    }
+
 }