I am trying to use weights on my histogram but all bins of the histogram returns to 0. Weights are stored in a friendtree branch. Each entry has a weight.

```
myhistogram = ROOT.TH3F('myhistogram','name', X, axesbinsX.GetArray(), Y, YArray, Z, ZArray)
cuts = "branchname1 < 10000"
tree.Draw(f"strings:{particle}>>+myhistogram", f"({cuts}) * cloned_tree.friend_tree.weights")
```

If i use a number instead the cloned_tree.friend_tree.weights, it works.

I tried to print the entries of this friend_tree by:

```
for entry in tree:
weight = getattr(entry, "friend_tree.weights")
```

and this actually prints the weights. There are non-zero weights but the weights are negative sometimes. Temporarily, I tried to set the weights to 0 when it is negative:

` tree.Draw(f"strings:{particle}>>+myhistogram", f"({cuts}) * (cloned_tree.friend_tree.weights> 0 ? cloned_tree.friend_tree.weights :0 )")`

Which did not work as well.