diff --git a/src/click-strategy.ts b/src/click-strategy.ts
index bf00d86..ab91c91 100644
--- a/src/click-strategy.ts
+++ b/src/click-strategy.ts
@@ -11,7 +11,12 @@ export class ClickStrategy<K> implements Strategy {
     element.addEventListener('click', async () => {
       const node = create()
 
-      await this.editor.addNode(node)
+      const added = await this.editor.addNode(node)
+
+      if (!added) {
+        console.warn('Node addition prevented:', node)
+        return
+      }
 
       const viewportCenter = this.getViewportCenter()
       const view = this.area.nodeViews.get(node.id)
diff --git a/src/drop-strategy.ts b/src/drop-strategy.ts
index 44e784c..ab59214 100644
--- a/src/drop-strategy.ts
+++ b/src/drop-strategy.ts
@@ -32,7 +32,12 @@ export class DropStrategy<K> implements Strategy {
   }
 
   private async drop(node: BaseSchemes['Node'], position: Position) {
-    await this.editor.addNode(node)
+    const added = await this.editor.addNode(node)
+
+    if (!added) {
+      console.warn('Node addition prevented:', node)
+      return
+    }
 
     const view = this.area.nodeViews.get(node.id)