diff --git a/packages/mermaid/src/diagrams/mindmap/mindmapDb.ts b/packages/mermaid/src/diagrams/mindmap/mindmapDb.ts
index 065f2c936..92426a7bb 100644
--- a/packages/mermaid/src/diagrams/mindmap/mindmapDb.ts
+++ b/packages/mermaid/src/diagrams/mindmap/mindmapDb.ts
@@ -43,7 +43,6 @@ export class MindmapDB {
     this.nodeType = nodeType;
     this.clear();
     this.getType = this.getType.bind(this);
-    this.getMindmap = this.getMindmap.bind(this);
     this.getElementById = this.getElementById.bind(this);
     this.getParent = this.getParent.bind(this);
     this.getMindmap = this.getMindmap.bind(this);
diff --git a/packages/mermaid/src/rendering-util/layout-algorithms/cose-bilkent/layout.ts b/packages/mermaid/src/rendering-util/layout-algorithms/cose-bilkent/layout.ts
index 79e3b8620..8d739c3a8 100644
--- a/packages/mermaid/src/rendering-util/layout-algorithms/cose-bilkent/layout.ts
+++ b/packages/mermaid/src/rendering-util/layout-algorithms/cose-bilkent/layout.ts
@@ -65,8 +65,8 @@ export function validateLayoutData(data: LayoutData): boolean {
     throw new Error('Root node is required');
   }
 
-  if (!Array.isArray(data.nodes)) {
-    throw new Error('Nodes array is required in layout data');
+  if (!data.nodes || !Array.isArray(data.nodes) || data.nodes.length === 0) {
+    throw new Error('No nodes found in layout data');
   }
 
   if (!Array.isArray(data.edges)) {