diff --git a/plugins/MergerSite/MergerSitePlugin.py b/plugins/MergerSite/MergerSitePlugin.py
index 3469af99..2fad78ed 100644
--- a/plugins/MergerSite/MergerSitePlugin.py
+++ b/plugins/MergerSite/MergerSitePlugin.py
@@ -128,7 +128,7 @@ class UiWebsocketPlugin(object):
 
             # Set the same cert for merged site
             merger_cert = self.user.getSiteData(self.site.address).get("cert")
-            if merger_cert:
+            if merger_cert and self.user.getSiteData(merged_address).get("cert") != merger_cert:
                 self.user.setCert(merged_address, merger_cert)
 
             site_before = self.site  # Save to be able to change it back after we ran the command