diff --git a/server/core/DbSearcher.js b/server/core/DbSearcher.js
index c0180bd..5b6888a 100644
--- a/server/core/DbSearcher.js
+++ b/server/core/DbSearcher.js
@@ -496,6 +496,7 @@ class DbSearcher {
             this.timer = null;
         }
 
+        this.heavyCalc.terminate();
         this.closed = true;
     }
 }