diff --git a/workflow-engine-form/src/main/java/cn/axzo/workflow/form/engine/cmd/CustomCreateFormInstanceCmd.java b/workflow-engine-form/src/main/java/cn/axzo/workflow/form/engine/cmd/CustomCreateFormInstanceCmd.java
index 84aa2f5ed..95e9145f0 100644
--- a/workflow-engine-form/src/main/java/cn/axzo/workflow/form/engine/cmd/CustomCreateFormInstanceCmd.java
+++ b/workflow-engine-form/src/main/java/cn/axzo/workflow/form/engine/cmd/CustomCreateFormInstanceCmd.java
@@ -94,7 +94,7 @@ public class CustomCreateFormInstanceCmd extends CreateFormInstanceCmd {
 
                 } else if (variableValue instanceof LocalDate) {
                     valuesNode.put(fieldId, ((LocalDate) variableValue).toString());
-                } else if (variableValue instanceof Collection) {
+                } else if (variableValue instanceof Collection || variableValue instanceof Map) {
                     if (CollectionUtils.isEmpty((Collection<?>) variableValue)) {
                         variableValue = Collections.emptyList();
                     }