diff --git a/code/numpy/transform.c b/code/numpy/transform.c
index b6b1bebc..b77364ba 100644
--- a/code/numpy/transform.c
+++ b/code/numpy/transform.c
@@ -204,6 +204,11 @@ static mp_obj_t transform_delete(size_t n_args, const mp_obj_t *pos_args, mp_map
             mp_raise_TypeError(MP_ERROR_TEXT("wrong index type"));
         }
         index_len = MP_OBJ_SMALL_INT_VALUE(mp_obj_len_maybe(indices));
+        if (index_len == 0){
+            // if the second positional argument is empty
+            // return the original array
+            return MP_OBJ_FROM_PTR(ndarray);
+        }
     }
 
     if(index_len > axis_len) {
diff --git a/code/ulab.c b/code/ulab.c
index 5c5067bd..5ff4e502 100644
--- a/code/ulab.c
+++ b/code/ulab.c
@@ -33,7 +33,7 @@
 #include "user/user.h"
 #include "utils/utils.h"
 
-#define ULAB_VERSION 6.4.2
+#define ULAB_VERSION 6.4.3
 #define xstr(s) str(s)
 #define str(s) #s
 
diff --git a/docs/ulab-change-log.md b/docs/ulab-change-log.md
index 4d389f9a..3650141f 100644
--- a/docs/ulab-change-log.md
+++ b/docs/ulab-change-log.md
@@ -1,3 +1,9 @@
+Mon, 25 Dec 2023
+
+version 6.4.3
+
+    fix the 'np.delete' error that occurs when passing an empty iterable object as the second positional argument (#653)
+
 Thu, 11 Dec 2023
 
 version 6.4.2
diff --git a/tests/2d/numpy/delete.py b/tests/2d/numpy/delete.py
index c7718ad5..fdb96a87 100644
--- a/tests/2d/numpy/delete.py
+++ b/tests/2d/numpy/delete.py
@@ -11,7 +11,9 @@
     a = np.array(range(25), dtype=dtype).reshape((5,5))
     print(np.delete(a, [1, 2], axis=0))
     print(np.delete(a, [1, 2], axis=1))
+    print(np.delete(a, [], axis=1))
     print(np.delete(a, [1, 5, 10]))
+    print(np.delete(a, []))
 
 for dtype in dtypes:
     a = np.array(range(25), dtype=dtype).reshape((5,5))
diff --git a/tests/2d/numpy/delete.py.exp b/tests/2d/numpy/delete.py.exp
index 72a2a286..e678f8dc 100644
--- a/tests/2d/numpy/delete.py.exp
+++ b/tests/2d/numpy/delete.py.exp
@@ -6,7 +6,17 @@ array([[0, 3, 4],
        [10, 13, 14],
        [15, 18, 19],
        [20, 23, 24]], dtype=uint8)
+array([[0, 1, 2, 3, 4],
+       [5, 6, 7, 8, 9],
+       [10, 11, 12, 13, 14],
+       [15, 16, 17, 18, 19],
+       [20, 21, 22, 23, 24]], dtype=uint8)
 array([0, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24], dtype=uint8)
+array([[0, 1, 2, 3, 4],
+       [5, 6, 7, 8, 9],
+       [10, 11, 12, 13, 14],
+       [15, 16, 17, 18, 19],
+       [20, 21, 22, 23, 24]], dtype=uint8)
 array([[0, 1, 2, 3, 4],
        [15, 16, 17, 18, 19],
        [20, 21, 22, 23, 24]], dtype=int8)
@@ -15,7 +25,17 @@ array([[0, 3, 4],
        [10, 13, 14],
        [15, 18, 19],
        [20, 23, 24]], dtype=int8)
+array([[0, 1, 2, 3, 4],
+       [5, 6, 7, 8, 9],
+       [10, 11, 12, 13, 14],
+       [15, 16, 17, 18, 19],
+       [20, 21, 22, 23, 24]], dtype=int8)
 array([0, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24], dtype=int8)
+array([[0, 1, 2, 3, 4],
+       [5, 6, 7, 8, 9],
+       [10, 11, 12, 13, 14],
+       [15, 16, 17, 18, 19],
+       [20, 21, 22, 23, 24]], dtype=int8)
 array([[0, 1, 2, 3, 4],
        [15, 16, 17, 18, 19],
        [20, 21, 22, 23, 24]], dtype=uint16)
@@ -24,7 +44,17 @@ array([[0, 3, 4],
        [10, 13, 14],
        [15, 18, 19],
        [20, 23, 24]], dtype=uint16)
+array([[0, 1, 2, 3, 4],
+       [5, 6, 7, 8, 9],
+       [10, 11, 12, 13, 14],
+       [15, 16, 17, 18, 19],
+       [20, 21, 22, 23, 24]], dtype=uint16)
 array([0, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24], dtype=uint16)
+array([[0, 1, 2, 3, 4],
+       [5, 6, 7, 8, 9],
+       [10, 11, 12, 13, 14],
+       [15, 16, 17, 18, 19],
+       [20, 21, 22, 23, 24]], dtype=uint16)
 array([[0, 1, 2, 3, 4],
        [15, 16, 17, 18, 19],
        [20, 21, 22, 23, 24]], dtype=int16)
@@ -33,7 +63,17 @@ array([[0, 3, 4],
        [10, 13, 14],
        [15, 18, 19],
        [20, 23, 24]], dtype=int16)
+array([[0, 1, 2, 3, 4],
+       [5, 6, 7, 8, 9],
+       [10, 11, 12, 13, 14],
+       [15, 16, 17, 18, 19],
+       [20, 21, 22, 23, 24]], dtype=int16)
 array([0, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24], dtype=int16)
+array([[0, 1, 2, 3, 4],
+       [5, 6, 7, 8, 9],
+       [10, 11, 12, 13, 14],
+       [15, 16, 17, 18, 19],
+       [20, 21, 22, 23, 24]], dtype=int16)
 array([[0.0, 1.0, 2.0, 3.0, 4.0],
        [15.0, 16.0, 17.0, 18.0, 19.0],
        [20.0, 21.0, 22.0, 23.0, 24.0]], dtype=float64)
@@ -42,7 +82,17 @@ array([[0.0, 3.0, 4.0],
        [10.0, 13.0, 14.0],
        [15.0, 18.0, 19.0],
        [20.0, 23.0, 24.0]], dtype=float64)
+array([[0.0, 1.0, 2.0, 3.0, 4.0],
+       [5.0, 6.0, 7.0, 8.0, 9.0],
+       [10.0, 11.0, 12.0, 13.0, 14.0],
+       [15.0, 16.0, 17.0, 18.0, 19.0],
+       [20.0, 21.0, 22.0, 23.0, 24.0]], dtype=float64)
 array([0.0, 2.0, 3.0, 4.0, 6.0, 7.0, 8.0, 9.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0], dtype=float64)
+array([[0.0, 1.0, 2.0, 3.0, 4.0],
+       [5.0, 6.0, 7.0, 8.0, 9.0],
+       [10.0, 11.0, 12.0, 13.0, 14.0],
+       [15.0, 16.0, 17.0, 18.0, 19.0],
+       [20.0, 21.0, 22.0, 23.0, 24.0]], dtype=float64)
 array([[0, 1, 2, 3, 4],
        [5, 6, 7, 8, 9],
        [15, 16, 17, 18, 19],