BUG: fix #1387. Raise ValueError for empty input to bincount.

2 files changed, 8 insertions, 0 deletions

diff --git a/numpy/lib/src/_compiled_base.c b/numpy/lib/src/_compiled_base.c
index e272e835a..38a446c06 100644
--- a/numpy/lib/src/_compiled_base.c
+++ b/numpy/lib/src/_compiled_base.c
@@ -117,6 +117,11 @@ arr_bincount(PyObject *NPY_UNUSED(self), PyObject *args, PyObject *kwds)
             goto fail;
     }
     len = PyArray_SIZE(lst);
+    if (len < 1) {
+        PyErr_SetString(PyExc_ValueError,
+                "The first argument cannot be empty.");
+        goto fail;
+    }
     numbers = (intp *) PyArray_DATA(lst);
     mxi = mxx(numbers, len);
     mni = mnx(numbers, len);
diff --git a/numpy/lib/tests/test_regression.py b/numpy/lib/tests/test_regression.py
index 9821ba97e..16add3295 100644
--- a/numpy/lib/tests/test_regression.py
+++ b/numpy/lib/tests/test_regression.py
@@ -176,6 +176,9 @@ class TestRegression(TestCase):
             sys.stdout = sys.__stdout__
             raise AssertionError("ticket #1243")
 
+    def test_bincount_empty(self):
+        """Ticket #1387: empty array as input for bincount."""
+        assert_raises(ValueError, lambda : np.bincount(np.array([], dtype=np.intp)))
 
 if __name__ == "__main__":
     run_module_suite()