diff --git a/gluex/jupyroot/hddmview.py b/gluex/jupyroot/hddmview.py
index b6c9e0d..6b15ee4 100644
--- a/gluex/jupyroot/hddmview.py
+++ b/gluex/jupyroot/hddmview.py
@@ -243,6 +243,10 @@ def setup_canvas(self, prefix="canvas", width=500, height=400):
       of a cell in a jupyter notebook, returns the name.
       """
       cname = f"canvas{id(self)}"
+      for i in range(999):
+          if cname + f".{i}" in self.canvases:
+              continue
+          cname += f".{i}"
       self.canvases[cname] = ROOT.TCanvas(cname, "", width, height)
       self.current_canvas = self.canvases[cname]
       return cname
diff --git a/gluex/jupyroot/treeview.py b/gluex/jupyroot/treeview.py
index 5239c87..ad58972 100644
--- a/gluex/jupyroot/treeview.py
+++ b/gluex/jupyroot/treeview.py
@@ -234,6 +234,10 @@ def setup_canvas(self, prefix="canvas", width=500, height=400):
       of a cell in a jupyter notebook, returns the name.
       """
       cname = f"canvas{id(self)}"
+      for i in range(999):
+          if cname + f".{i}" in self.canvases:
+              continue
+          cname += f".{i}"
       self.canvases[cname] = ROOT.TCanvas(cname, "", width, height)
       self.current_canvas = self.canvases[cname]
       return cname
diff --git a/setup.py b/setup.py
index c078779..13cc44e 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='gluex.jupyroot',
-    version='1.0.5',
+    version='1.0.6',
     packages=['gluex.jupyroot'],
     install_requires=[],  # Add dependencies here if any
     description='Automate common data analysis and visualization tasks using the CERN pyroot library in a jupyter notebook.',