diff --git a/numpy/_core/src/umath/string_ufuncs.cpp b/numpy/_core/src/umath/string_ufuncs.cpp
index 95f30ccb109e..7fa74bf93f80 100644
--- a/numpy/_core/src/umath/string_ufuncs.cpp
+++ b/numpy/_core/src/umath/string_ufuncs.cpp
@@ -941,8 +941,9 @@ string_expandtabs_length_promoter(PyObject *NPY_UNUSED(ufunc),
PyArray_DTypeMeta *const op_dtypes[], PyArray_DTypeMeta *const signature[],
PyArray_DTypeMeta *new_op_dtypes[])
{
- Py_INCREF(op_dtypes[0]);
- new_op_dtypes[0] = op_dtypes[0];
+ PyArray_DTypeMeta* _op_dtype = op_dtypes[0] ? op_dtypes[0] : op_dtypes[1];
+ Py_INCREF(_op_dtype);
+ new_op_dtypes[0] = _op_dtype;
new_op_dtypes[1] = NPY_DT_NewRef(&PyArray_Int64DType);
new_op_dtypes[2] = PyArray_DTypeFromTypeNum(NPY_DEFAULT_INT);
return 0;
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