diff --git a/code/modules/xenoarcheaology/tools/tools.dm b/code/modules/xenoarcheaology/tools/tools.dm
index fa1d87c686..9050977e34 100644
--- a/code/modules/xenoarcheaology/tools/tools.dm
+++ b/code/modules/xenoarcheaology/tools/tools.dm
@@ -215,6 +215,7 @@
 					current = null
 			else
 				QDEL_LIST_NULL(positive_locations)
+				positive_locations = list()
 				QDEL_NULL(current)
 			return TRUE