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-rw-r--r--src/world.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/world.c b/src/world.c
index b26ff55..9ebdaac 100644
--- a/src/world.c
+++ b/src/world.c
@@ -267,6 +267,10 @@ struct LilvHeader*
lilv_collection_get_by_uri(const ZixTree* const_seq,
const LilvNode* uri)
{
+ if (!lilv_node_is_uri(uri)) {
+ return NULL;
+ }
+
ZixTree* seq = (ZixTree*)const_seq;
struct LilvHeader key = { NULL, (LilvNode*)uri };