diff --git a/src/main.c b/src/main.c
index 05548ff..8a46e60 100644
--- a/src/main.c
+++ b/src/main.c
@@ -102,7 +102,7 @@ static void cve_add_package_internal(struct source_package_t *pkg)
                 return;
         }
 
-        if (self->mapping) {
+        if (self->mapping && g_hash_table_contains(self->mapping, pkg->name)) {
                 q = g_hash_table_lookup(self->mapping, pkg->name);
 
                 /*