diff --git a/src/tensortrax/__about__.py b/src/tensortrax/__about__.py
index 32e6e64..3452608 100644
--- a/src/tensortrax/__about__.py
+++ b/src/tensortrax/__about__.py
@@ -2,4 +2,4 @@
 tensorTRAX: Math on (Hyper-Dual) Tensors with Trailing Axes.
 """
 
-__version__ = "0.21.2"
+__version__ = "0.21.3"
diff --git a/src/tensortrax/math/special/_special_tensor.py b/src/tensortrax/math/special/_special_tensor.py
index 9e85ddb..72108ea 100644
--- a/src/tensortrax/math/special/_special_tensor.py
+++ b/src/tensortrax/math/special/_special_tensor.py
@@ -82,6 +82,6 @@ def from_triu_2d(A):
 def try_stack(arrays, fallback=None):
     "Try to unpack and stack the list of tensors and return the fallback otherwise."
     try:
-        return stack([A for ary in arrays for A in ary])
+        return stack([A.x for ary in arrays for A in ary])
     except ValueError:
         return fallback
diff --git a/tests/test_math.py b/tests/test_math.py
index a46d695..4f67368 100644
--- a/tests/test_math.py
+++ b/tests/test_math.py
@@ -255,7 +255,7 @@ def test_try_stack():
     fallback = "my fallback"
 
     stacked = tm.special.try_stack([C6, C6], fallback=fallback)
-    assert stacked.shape == (12,)
+    assert stacked.shape[0] == 12
 
     assert tm.special.try_stack([C, C6], fallback=fallback) == fallback
     with pytest.raises(ValueError):