diff --git a/src/mkdocstrings/templates/python/material/_base/class.html b/src/mkdocstrings/templates/python/material/_base/class.html
index 6f5e4a2b..37724e17 100644
--- a/src/mkdocstrings/templates/python/material/_base/class.html
+++ b/src/mkdocstrings/templates/python/material/_base/class.html
@@ -54,7 +54,7 @@
         {% include "docstring.html" with context %}
       {% endwith %}
 
-      {% if config.show_source %}
+      {% if config.show_source and class.source %}
         <details class="quote">
           <summary>Source code in <code>{{ class.relative_filepath }}</code></summary>
           {{ class.source|highlight(language="python", linestart=class.lineno, linenums=True) }}
diff --git a/src/mkdocstrings/templates/python/material/_base/function.html b/src/mkdocstrings/templates/python/material/_base/function.html
index 928ac7d4..8538447f 100644
--- a/src/mkdocstrings/templates/python/material/_base/function.html
+++ b/src/mkdocstrings/templates/python/material/_base/function.html
@@ -62,7 +62,7 @@
         {% include "docstring.html" with context %}
       {% endwith %}
 
-      {% if config.show_source %}
+      {% if config.show_source and function.source %}
         <details class="quote">
           <summary>Source code in <code>{{ function.relative_filepath }}</code></summary>
           {{ function.source|highlight(language="python", linestart=function.lineno, linenums=True) }}