diff --git a/packages/visual-flow/src/model/block.ts b/packages/visual-flow/src/model/block.ts
index ef39b59..a542e5d 100644
--- a/packages/visual-flow/src/model/block.ts
+++ b/packages/visual-flow/src/model/block.ts
@@ -319,6 +319,7 @@ export abstract class Block extends ModelBase {
   }
 
   isDockableBy(block: Block): null | [number, Direction, Point] {
+    if (this === block || this.predicting) return null;
     let minDockingDistanceSquare = MIN_DOCKING_DISTANCE_SQUARE;
     let dockingInfo: [Direction, Point] | null = null;
     for (const direction of this.dockableDirections) {
diff --git a/packages/visual-flow/src/model/graph.ts b/packages/visual-flow/src/model/graph.ts
index 0d0d4a5..9f499c6 100644
--- a/packages/visual-flow/src/model/graph.ts
+++ b/packages/visual-flow/src/model/graph.ts
@@ -517,7 +517,6 @@ export class Graph {
     for (let i = this.blockZIndex.length - 1; i >= 0; i--) {
       const target = this.blockZIndex[i];
       if (!target) continue;
-      if (target === block) continue;
       const result = target.isDockableBy(block);
       if (result !== null) {
         const [distanceSquare, ...dockingInfo] = result;