diff --git a/gramps/gen/datehandler/_date_ru.py b/gramps/gen/datehandler/_date_ru.py
index 3682247fd..9437c34ff 100644
--- a/gramps/gen/datehandler/_date_ru.py
+++ b/gramps/gen/datehandler/_date_ru.py
@@ -132,6 +132,11 @@ class DateDisplayRU(DateDisplay):
                                                    inflect, long_months)
         elif date_val[1] == 0: # month is zero but day is not (see 8477)
             return self.display_iso(date_val)
+        elif not hasattr(long_months[date_val[1]], 'f'): # not a Lexeme
+            return "{day:d} {long_month} {year}".format(
+                     day = date_val[0],
+                     long_month = long_months[date_val[1]],
+                     year = year)
         else:
             return "{day:d} {long_month.f[Р]} {year}".format(
                      day = date_val[0],
@@ -151,6 +156,11 @@ class DateDisplayRU(DateDisplay):
                                                     inflect, short_months)
         elif date_val[1] == 0: # month is zero but day is not (see 8477)
             return self.display_iso(date_val)
+        elif not hasattr(short_months[date_val[1]], 'f'): # not a Lexeme
+            return "{day:d} {short_month} {year}".format(
+                     day = date_val[0],
+                     short_month = short_months[date_val[1]],
+                     year = year)
         else:
             return "{day:d} {short_month.f[Р]} {year}".format(
                      day = date_val[0],