diff --git a/src/backend/langflow/graph/nodes.py b/src/backend/langflow/graph/nodes.py
index ea94e10b8..5f136b3c7 100644
--- a/src/backend/langflow/graph/nodes.py
+++ b/src/backend/langflow/graph/nodes.py
@@ -64,7 +64,7 @@ class PromptNode(Node):
                 )
                 # flatten the list of tools if it is a list of lists
                 # first check if it is a list
-                if isinstance(tools, list) and isinstance(tools[0], list):
+                if tools and isinstance(tools, list) and isinstance(tools[0], list):
                     tools = [tool for sublist in tools for tool in sublist]
 
                 self.params["tools"] = tools