diff --git a/gramps/plugins/tool/mergecitations.py b/gramps/plugins/tool/mergecitations.py
index d8e590d51..a5ba539d3 100644
--- a/gramps/plugins/tool/mergecitations.py
+++ b/gramps/plugins/tool/mergecitations.py
@@ -196,6 +196,8 @@ class MergeCitations(tool.BatchTool,ManagedWindow):
                     "that has a citation reference." % class_name)
 
                 citation = db.get_citation_from_handle(citation_handle)
+                if citation is None:
+                    continue
                 key = citation.get_page()
                 if fields != IGNORE_DATE and fields != IGNORE_BOTH:
                     key += "\n" + get_date(citation)