diff --git a/src/stores/modelToNodeStore.test.ts b/src/stores/modelToNodeStore.test.ts
index b9528ca47d..3d8665ed27 100644
--- a/src/stores/modelToNodeStore.test.ts
+++ b/src/stores/modelToNodeStore.test.ts
@@ -539,5 +539,16 @@ describe('useModelToNodeStore', () => {
       expect(modelToNodeStore.getNodeProvider('')).toBeUndefined()
       expect(modelToNodeStore.getAllNodeProviders('')).toEqual([])
     })
+
+    it('should handle invalid input types gracefully', () => {
+      const modelToNodeStore = useModelToNodeStore()
+      modelToNodeStore.registerDefaults()
+
+      expect(modelToNodeStore.getNodeProvider(null as any)).toBeUndefined()
+      expect(modelToNodeStore.getNodeProvider(undefined as any)).toBeUndefined()
+      expect(modelToNodeStore.getNodeProvider(123 as any)).toBeUndefined()
+      expect(modelToNodeStore.getAllNodeProviders(null as any)).toEqual([])
+      expect(modelToNodeStore.getAllNodeProviders(undefined as any)).toEqual([])
+    })
   })
 })
diff --git a/src/stores/modelToNodeStore.ts b/src/stores/modelToNodeStore.ts
index 3b77220cb1..a17aee9a8e 100644
--- a/src/stores/modelToNodeStore.ts
+++ b/src/stores/modelToNodeStore.ts
@@ -81,6 +81,10 @@ export const useModelToNodeStore = defineStore('modelToNode', () => {
   function findProvidersWithFallback(
     modelType: string
   ): ModelNodeProvider[] | undefined {
+    if (!modelType || typeof modelType !== 'string') {
+      return undefined
+    }
+
     const exactMatch = modelToNodeMap.value[modelType]
     if (exactMatch && exactMatch.length > 0) return exactMatch