diff --git a/snakemake/report/__init__.py b/snakemake/report/__init__.py
index 965bc0a5d..bfb061959 100644
--- a/snakemake/report/__init__.py
+++ b/snakemake/report/__init__.py
@@ -492,6 +492,8 @@ def render(self, env, rst_links, categories, files):
                     ),
                     e,
                 )
+        else:
+            self.caption = ""
 
     @property
     def is_img(self):