diff --git a/bintree.c b/bintree.c
index c55d660..71ed18a 100644
--- a/bintree.c
+++ b/bintree.c
@@ -21,7 +21,7 @@
     unsigned int    treeSize        (const TreeNode *root);
 
     // self declared functions
-    TreeNode        *addToTreeRec   (TreeNode *currentNode, TreeNode *newNode, CompareFctType compareFct, int *isDuplicate);
+    TreeNode        *addToTreeRec   (TreeNode *currentNode, TreeNode *newNode, CompareFctType compareFct, int *isDuplicate, const int root);
     void            clearTreeRec    (TreeNode *currentNode);
     void            clearNode       (TreeNode *node);
     void            treeSizeRec     (const TreeNode *currentNode, unsigned int *nodeCount);
@@ -44,16 +44,16 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
     memcpy(newNode->data, data, dataSize);
 
 
-    return addToTreeRec(root, newNode, compareFct, isDuplicate);
+    return addToTreeRec(root, newNode, compareFct, isDuplicate, 1);
 }
 
 
-TreeNode *addToTreeRec(TreeNode *currentNode, TreeNode *newNode, CompareFctType compareFct, int *isDuplicate)
+TreeNode *addToTreeRec(TreeNode *currentNode, TreeNode *newNode, CompareFctType compareFct, int *isDuplicate, const int root)
 {
     if ((currentNode == NULL))
     {
         // printf("Node == NULL\n");
-        if (isDuplicate == NULL)
+        if ((isDuplicate == NULL) || root)
         {
             return newNode;
         }
@@ -65,19 +65,19 @@ TreeNode *addToTreeRec(TreeNode *currentNode, TreeNode *newNode, CompareFctType
     else if ((compareFct(currentNode->data, newNode->data) < 0))
     {
         // printf("<0\n");
-        currentNode->left   = addToTreeRec(currentNode->left, newNode, compareFct, isDuplicate);
+        currentNode->left   = addToTreeRec(currentNode->left, newNode, compareFct, isDuplicate, 0);
     }
     else if ((compareFct(currentNode->data, newNode->data) > 0))
     {
         // printf(">0\n");
-        currentNode->right  = addToTreeRec(currentNode->right, newNode, compareFct, isDuplicate);
+        currentNode->right  = addToTreeRec(currentNode->right, newNode, compareFct, isDuplicate, 0);
     }
     else if ((compareFct(currentNode->data, newNode->data) == 0))
     {
         // printf("==0\n");
         if (isDuplicate == NULL)
         {
-            currentNode->left = addToTreeRec(currentNode->left, newNode, compareFct, isDuplicate);
+            currentNode->left = addToTreeRec(currentNode->left, newNode, compareFct, isDuplicate, 0);
         }
         else
         {
diff --git a/bintree.o b/bintree.o
index 707274c..c1bf070 100644
Binary files a/bintree.o and b/bintree.o differ
diff --git a/bintreeTests.c b/bintreeTests.c
index 8e33e98..40fdc05 100644
--- a/bintreeTests.c
+++ b/bintreeTests.c
@@ -116,15 +116,15 @@ void test_clearTreeworksLikeExpected(void)
     printf("Tree Filled\n");
 
    // Save all Adresses
-   void *node1  = testRoot->left;
-   /*
+   TreeNode *node1  = testRoot->left;
+   
    TreeNode *node2  = testRoot->left->left;
    TreeNode *node3  = testRoot->left->right;
    TreeNode *node4  = testRoot->right;
    TreeNode *node5  = testRoot->right->left;
    TreeNode *node6  = testRoot->right->right;
    TreeNode *node7  = testRoot->left->left->left;
-   */
+   
    printf("Adresses Saved\n");
 
    clearTree(testRoot);
@@ -132,7 +132,7 @@ void test_clearTreeworksLikeExpected(void)
 
     // Check if everything has been set to NULL
     TEST_ASSERT_NULL(testRoot->data);
-    //TEST_ASSERT_NULL(testRoot);
+    TEST_ASSERT_NULL(testRoot);
     
     //TEST_ASSERT_NULL(node1->data);
     // TEST_ASSERT_NULL(node1);
@@ -199,9 +199,9 @@ int main()
     UNITY_BEGIN();
 
     printf("\n============================\nBinary Tree tests\n============================\n");
-     RUN_TEST(test_addToTreeExpandsTreeCorrectly);
+    // RUN_TEST(test_addToTreeExpandsTreeCorrectly);
     // RUN_TEST(test_nextTreeDataReturnsNextDataCorrectly);
-    // RUN_TEST(test_clearTreeworksLikeExpected);
+    RUN_TEST(test_clearTreeworksLikeExpected);
     // RUN_TEST(test_treeSizeWorkingLikeExpected);
 
     return UNITY_END();
diff --git a/runbintreeTests.exe b/runbintreeTests.exe
index 1e05d19..a66c8f7 100644
Binary files a/runbintreeTests.exe and b/runbintreeTests.exe differ