diff --git a/core/src/list.c b/core/src/list.c
index 6ec9a6a..68a416b 100644
--- a/core/src/list.c
+++ b/core/src/list.c
@@ -30,6 +30,8 @@ List list_copy(const List* source) {
     if(self.cap > 0) {
         memcpy(self.data, source->data, source->element_size * source->len);
         self.len = source->len;
+    } else {
+        LOG_ERROR("Failed to reserve space");
     }
     return self;
 }