diff --git a/zeus/utils/framework.py b/zeus/utils/framework.py
index b321e0e0..c745b9d1 100644
--- a/zeus/utils/framework.py
+++ b/zeus/utils/framework.py
@@ -121,9 +121,8 @@ def all_reduce(
         ):
             return object
 
-        # wrap object in a tensor if it is not already
-        if not isinstance(object, torch.Tensor):
-            object = torch.Tensor(object)
+        # wrap object in a tensor
+        tensor = torch.Tensor(object)
 
         # determine operation
         if operation == "sum":
@@ -133,8 +132,8 @@ def all_reduce(
         else:
             raise ValueError(f"all_reduce unsupported operation: {operation}")
 
-        torch.distributed.all_reduce(object.cuda(), op=torch_op)
-        return object.cpu().tolist()
+        torch.distributed.all_reduce(tensor, op=torch_op)
+        return tensor.cpu().tolist()
 
     if jax_is_available():
         # Check if not distributed
@@ -155,3 +154,4 @@ def is_distributed() -> bool:
     if jax_is_available():
         jax = MODULE_CACHE["jax"]
         return jax.process_count() > 1
+    raise RuntimeError("No framework is available.")