diff --git a/src/m_menu.c b/src/m_menu.c
index bf9b59435..bcee32989 100644
--- a/src/m_menu.c
+++ b/src/m_menu.c
@@ -3208,7 +3208,8 @@ static boolean M_UpdateLevelPlatter(void)
 	}
 
 	// check headers for the last map added, too!
-	M_MakeLevelSelectHeader(&levelselect.rows[headerRow], previtermap, NULL);
+	if (previtermap != NULL)
+		M_MakeLevelSelectHeader(&levelselect.rows[headerRow], previtermap, NULL);
 
 	return numsortedmaps > 0;
 }