diff --git a/table.c b/table.c
index d357f2e..fc6f866 100644
--- a/table.c
+++ b/table.c
@@ -125,6 +125,9 @@ int table_insert(struct table *t, void *entry)
 
 void *table_lookup(struct table *t, int idx)
 {
+    if (t->size < 1)
+        return NULL;
+
     if (t->dirty) {
         t->lookup = realloc(t->lookup, t->size*sizeof(void *));
         // TODO: check allocation