diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetFormInstanceModelCmd.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetFormInstanceModelCmd.java
index e8765638b..3fca8df22 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetFormInstanceModelCmd.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetFormInstanceModelCmd.java
@@ -323,20 +323,22 @@ public class CustomGetFormInstanceModelCmd extends GetFormInstanceModelCmd {
                                             }
                                         } else if (FormFieldTypes.UPLOAD.equals(sf.getType())
                                                 || FORM_FIELD_TYPE_IMAGE.equals(sf.getType())) {
-                                            if (rows.get(0).containsKey(sf.getId())) {
+                                            if (StringUtils.hasText(String.valueOf(rows.get(0).get(sf.getId())))) {
+                                                if (rows.get(0).containsKey(sf.getId())) {
 
-                                                try {
-                                                    String updateValueJson = objectMapper.writeValueAsString(rows.get(0).get(sf.getId()));
-                                                    if (StringUtils.hasText(updateValueJson)) {
-                                                        List<UploadFieldDTO> uploadFiles = formEngineConfiguration.getObjectMapper()
-                                                                .readValue(updateValueJson, new TypeReference<List<UploadFieldDTO>>() {
-                                                                });
-                                                        sf.setValue(uploadFiles);
+                                                    try {
+                                                        String updateValueJson = objectMapper.writeValueAsString(rows.get(0).get(sf.getId()));
+                                                        if (StringUtils.hasText(updateValueJson)) {
+                                                            List<UploadFieldDTO> uploadFiles = formEngineConfiguration.getObjectMapper()
+                                                                    .readValue(updateValueJson, new TypeReference<List<UploadFieldDTO>>() {
+                                                                    });
+                                                            sf.setValue(uploadFiles);
+                                                        }
+                                                    } catch (JsonProcessingException e) {
+                                                        throw new FlowableException("Error parsing upload files json ", e);
                                                     }
-                                                } catch (JsonProcessingException e) {
-                                                    throw new FlowableException("Error parsing upload files json ", e);
-                                                }
 
+                                                }
                                             }
                                         }
                                     });