diff --git a/core/api.go b/core/api.go
index ba6f225..51774f5 100644
--- a/core/api.go
+++ b/core/api.go
@@ -162,7 +162,7 @@ func (caller apiCaller) blockAPI(w http.ResponseWriter, r *http.Request) error {
 	mg := caller.mg
 	if r.Method == "GET" {
 		target, ok := gocommon.ReadObjectIDFormValue(r.Form, "accid")
-		if ok {
+		if !ok {
 			json.NewEncoder(w).Encode(mg.bl.all())
 		} else if !target.IsZero() {
 			if blocked, ok := mg.bl.get(target); ok && blocked != nil {