diff --git a/pkg/iplibrary/default_ip_library.go b/pkg/iplibrary/default_ip_library.go
index 11741cc..ee9d817 100644
--- a/pkg/iplibrary/default_ip_library.go
+++ b/pkg/iplibrary/default_ip_library.go
@@ -119,5 +119,6 @@ func (this *IPLibrary) LookupIP(ip string) *QueryResult {
 func (this *IPLibrary) Destroy() {
 	if this.reader != nil {
 		this.reader.Destroy()
+		this.reader = nil
 	}
 }