diff --git a/src/notification.c b/src/notification.c
index 7291758..6d609cc 100644
--- a/src/notification.c
+++ b/src/notification.c
@@ -204,7 +204,9 @@ void rawimage_free(RawImage *i)
 /* see notification.h */
 void notification_free(notification *n)
 {
-        assert(n != NULL);
+        if (!n)
+                return;
+
         g_free(n->appname);
         g_free(n->summary);
         g_free(n->body);
diff --git a/src/notification.h b/src/notification.h
index 47500f6..ab21e3c 100644
--- a/src/notification.h
+++ b/src/notification.h
@@ -119,7 +119,7 @@ void rawimage_free(RawImage *i);
 /**
  * Free the memory used by the given notification.
  *
- * @param n: pointer to #notification
+ * @param n (nullable): pointer to #notification
  */
 void notification_free(notification *n);