diff --git a/imperative/python/src/tensor.cpp b/imperative/python/src/tensor.cpp
index a93dc43d77ea0045ecaf2221434884a2b2adbe22..887dbd1342c2f48b98bfd3921da33deaf536aa65 100644
--- a/imperative/python/src/tensor.cpp
+++ b/imperative/python/src/tensor.cpp
@@ -672,7 +672,17 @@ PyObject* TensorWrapper::format() {
 PyObject* TensorWrapper::numpy() {
     auto hv = m_tensor->numpy();
     if (!hv) {
-        PyErr_SetString(PyExc_ValueError, "tensor invalid");
+        if (TransformationManager::get_instance()
+                    .segments[TransformationManager::Segment::Eval]
+                    .size() > 1) {
+            PyErr_SetString(
+                    PyExc_ValueError,
+                    "tensor invalid, can not infer value of this tensor under "
+                    "trace(symbolic=True). You can try to use trace(symbolic=False) to "
+                    "avoid this issue.");
+        } else {
+            PyErr_SetString(PyExc_ValueError, "tensor invalid");
+        }
         return nullptr;
     }
     auto arr = py::reinterpret_steal<py::array>(