diff --git a/packages/components/nodes/utilities/CustomFunction/CustomFunction.ts b/packages/components/nodes/utilities/CustomFunction/CustomFunction.ts
index b358b24b3..37511e476 100644
--- a/packages/components/nodes/utilities/CustomFunction/CustomFunction.ts
+++ b/packages/components/nodes/utilities/CustomFunction/CustomFunction.ts
@@ -65,7 +65,7 @@ class CustomFunction_Utilities implements INode {
                 inputVars =
                     typeof functionInputVariablesRaw === 'object' ? functionInputVariablesRaw : JSON.parse(functionInputVariablesRaw)
             } catch (exception) {
-                throw new Error("Invalid JSON in the PromptTemplate's promptValues: " + exception)
+                throw new Error('Invalid JSON in the Custom Function Input Variables: ' + exception)
             }
         }
 
diff --git a/packages/server/src/utils/index.ts b/packages/server/src/utils/index.ts
index e7a35c820..9c2d1d79d 100644
--- a/packages/server/src/utils/index.ts
+++ b/packages/server/src/utils/index.ts
@@ -561,7 +561,11 @@ export const getVariableValue = (
         variablePaths.forEach((path) => {
             const variableValue = variableDict[path]
             // Replace all occurrence
-            returnVal = returnVal.split(path).join(variableValue)
+            if (typeof variableValue === 'object') {
+                returnVal = returnVal.split(path).join(JSON.stringify(variableValue).replace(/"/g, '\\"'))
+            } else {
+                returnVal = returnVal.split(path).join(variableValue)
+            }
         })
         return returnVal
     }
diff --git a/packages/ui/src/ui-component/dialog/ExpandTextDialog.js b/packages/ui/src/ui-component/dialog/ExpandTextDialog.js
index 0ef70e29e..f4fdb9f9e 100644
--- a/packages/ui/src/ui-component/dialog/ExpandTextDialog.js
+++ b/packages/ui/src/ui-component/dialog/ExpandTextDialog.js
@@ -67,7 +67,11 @@ const ExpandTextDialog = ({ show, dialogProps, onCancel, onConfirm }) => {
 
     useEffect(() => {
         if (executeCustomFunctionNodeApi.data) {
-            setCodeExecutedResult(executeCustomFunctionNodeApi.data)
+            if (typeof executeCustomFunctionNodeApi.data === 'object') {
+                setCodeExecutedResult(JSON.stringify(executeCustomFunctionNodeApi.data, null, 2))
+            } else {
+                setCodeExecutedResult(executeCustomFunctionNodeApi.data)
+            }
         }
     }, [executeCustomFunctionNodeApi.data])