diff --git a/panel/models/reactive_html.py b/panel/models/reactive_html.py
index be6219a1ff..06fbd74238 100644
--- a/panel/models/reactive_html.py
+++ b/panel/models/reactive_html.py
@@ -81,6 +81,10 @@ def handle_data(self, data):
elif nloops:
loop = [loop for loop in (list_loop, values_loop, items_loop) if loop][0]
var, obj = loop[0]
+ if var in self.cls.param:
+ raise ValueError(f'Loop variable {var} clashes with parameter name. '
+ 'Ensure loop variables have a unique name. Relevant '
+ f'template section:\n\n{data}')
self.loop_map[var] = obj
if '{% for ' in data:
diff --git a/panel/reactive.py b/panel/reactive.py
index 103a650611..676f48e91e 100644
--- a/panel/reactive.py
+++ b/panel/reactive.py
@@ -1310,7 +1310,14 @@ def _get_template(self):
context[parameter] = value
if parameter in self._child_names:
context[f'{parameter}_names'] = self._child_names[parameter]
- html = template.render(context)
+ try:
+ html = template.render(context)
+ except Exception as e:
+ raise RuntimeError(
+ f"{type(self).__name__} could not render "
+ f"template, errored with:\n\n{type(e).__name__}: {e}.\n"
+ f"Full template:\n\n{template_string}"
+ )
# Parse templated HTML
parser = ReactiveHTMLParser(self.__class__, template=False)