List widget need unique id's to tell them apart

scripts/addons/cam/ui/panels/chains_panel.py

@@ -59,7 +59,7 @@ class CAM_CHAINS_Panel(CAMParentPanel, Panel):
 
             row.template_list(
                 "CAM_UL_chains",
-                "",
+                "id_list_chains",
                 scene,
                 "cam_chains",
                 scene,
@@ -86,7 +86,7 @@ class CAM_CHAINS_Panel(CAMParentPanel, Panel):
                 if chain:
                     row.template_list(
                         "CAM_UL_operations",
-                        "",
+                        "id_list_chain_operations",
                         chain,
                         "operations",
                         chain,

scripts/addons/cam/ui/panels/operations_panel.py

@@ -40,7 +40,7 @@ class CAM_OPERATIONS_Panel(CAMParentPanel, Panel):
         row = layout.row()
         row.template_list(
             "CAM_UL_operations",
-            "",
+            "id_list_operations",
             bpy.context.scene,
             "cam_operations",
             bpy.context.scene,