diff --git a/src/asammdf/blocks/cutils.c b/src/asammdf/blocks/cutils.c
index 2c61df81e..cda143fba 100644
--- a/src/asammdf/blocks/cutils.c
+++ b/src/asammdf/blocks/cutils.c
@@ -1346,7 +1346,8 @@ static PyObject *data_block_from_arrays(PyObject *self, PyObject *args)
                 bytes = PyTuple_GET_ITEM(item, 0);
                 if (!PyArray_IS_C_CONTIGUOUS((PyArrayObject *)bytes))
                 {
-                    PyErr_SetString(PyExc_ValueError, "All arrays passed to data_block_from_arrays must be C contiguous\n\0");
+                    PY_PRINTF(bytes)
+                    PyErr_SetString(PyExc_ValueError, "All arrays passed to data_block_from_arrays must be C contiguous; i=%d of %d\n\0", i, size);
                     return NULL;
                 }
                 itemsize = PyTuple_GET_ITEM(item, 1);