diff --git a/workflow-engine-common/src/main/java/cn/axzo/workflow/common/model/request/bpmn/task/BpmnTaskAuditDTO.java b/workflow-engine-common/src/main/java/cn/axzo/workflow/common/model/request/bpmn/task/BpmnTaskAuditDTO.java
index 61b1a17bf..0cfe59964 100644
--- a/workflow-engine-common/src/main/java/cn/axzo/workflow/common/model/request/bpmn/task/BpmnTaskAuditDTO.java
+++ b/workflow-engine-common/src/main/java/cn/axzo/workflow/common/model/request/bpmn/task/BpmnTaskAuditDTO.java
@@ -106,7 +106,9 @@ public class BpmnTaskAuditDTO {
     private String operationDesc;
 
     /**
-     * 更新或新增流程变量
+     * 更新或新增流程变量,
+     * <p>
+     * 如果不修改，则map 的 value 设置为 null，内部会自动过滤
      */
     private Map<String, Object> variables;
 }
diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/conf/SupportRefreshProperties.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/conf/SupportRefreshProperties.java
index 9f4f247c8..3cfdd25b0 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/conf/SupportRefreshProperties.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/conf/SupportRefreshProperties.java
@@ -109,7 +109,7 @@ public class SupportRefreshProperties {
     @Value("${workflow.ignoreMqAlterApplicationNames:}")
     private List<String> ignoreMqAlterApplicationNames;
 
-    @Value("${workflow.processLogHtmlUrl:https://taskflow-web.axzo.cn/#/document/log?processInstanceId=%s&personId=%d}")
+    @Value("${workflow.processLogHtmlUrl:https://taskflow-web.axzo.cn/#/document/log?processInstanceId=%s&personId=%s}")
     private String processLogHtmlUrl;
 
 }
diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetProcessInstanceVariablesCmd.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetProcessInstanceVariablesCmd.java
index 80ffb959a..469dfe7d4 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetProcessInstanceVariablesCmd.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomGetProcessInstanceVariablesCmd.java
@@ -67,7 +67,9 @@ public class CustomGetProcessInstanceVariablesCmd extends AbstractCommand<Map<St
         HistoryService historyService = processEngineConfiguration.getHistoryService();
         HistoricProcessInstance instance = historyService.createHistoricProcessInstanceQuery()
                 .processInstanceId(processInstanceId).includeProcessVariables().singleResult();
-
+        if (Objects.isNull(instance)) {
+            return variables;
+        }
         variables.put(PRINT_VAR_PROCESS_NAME, instance.getName());
         variables.put(PRINT_VAR_PROCESS_BELONG_TENANT_ID, instance.getTenantId());
         // 添加流程开始时间
diff --git a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/repository/mapper/ExtAxProcessLogMapper.java b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/repository/mapper/ExtAxProcessLogMapper.java
index 185b648ac..3eefd77b1 100644
--- a/workflow-engine-core/src/main/java/cn/axzo/workflow/core/repository/mapper/ExtAxProcessLogMapper.java
+++ b/workflow-engine-core/src/main/java/cn/axzo/workflow/core/repository/mapper/ExtAxProcessLogMapper.java
@@ -1,9 +1,13 @@
 package cn.axzo.workflow.core.repository.mapper;
 
+import cn.axzo.workflow.core.conf.handler.ListAssigneeTypeHandler;
 import cn.axzo.workflow.core.repository.entity.ExtAxProcessLog;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Result;
+import org.apache.ibatis.annotations.Results;
 import org.apache.ibatis.annotations.Select;
 import org.apache.ibatis.annotations.Update;
+import org.apache.ibatis.type.JdbcType;
 
 @Mapper
 public interface ExtAxProcessLogMapper extends BaseMapperX<ExtAxProcessLog> {
@@ -13,5 +17,8 @@ public interface ExtAxProcessLogMapper extends BaseMapperX<ExtAxProcessLog> {
 
 
     @Select("select * from ext_ax_process_log WHERE process_instance_id = #{processInstanceId} and task_id = #{taskId}")
+    @Results({
+            @Result(column = "assignee_full", property = "assigneeFull", jdbcType = JdbcType.ARRAY, typeHandler = ListAssigneeTypeHandler.class)
+    })
     ExtAxProcessLog findByProcessIdAndTaskIdWithDeleted(String processInstanceId, String taskId);
 }
diff --git a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/web/bpmn/BpmnProcessTaskController.java b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/web/bpmn/BpmnProcessTaskController.java
index 29b7a051b..ffdec2cac 100644
--- a/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/web/bpmn/BpmnProcessTaskController.java
+++ b/workflow-engine-server/src/main/java/cn/axzo/workflow/server/controller/web/bpmn/BpmnProcessTaskController.java
@@ -54,6 +54,7 @@ import javax.validation.constraints.NotEmpty;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 import static cn.axzo.workflow.common.code.BpmnTaskRespCode.TASK_OPERATION_PARAM_INVALID;
@@ -112,6 +113,10 @@ public class BpmnProcessTaskController extends BasicPopulateAvatarController imp
         if (!StringUtils.hasText(dto.getTaskId())) {
             dto.setTaskId(bpmnProcessTaskService.findTaskIdByInstanceIdAndPersonId(dto.getProcessInstanceId(), dto.getApprover().getPersonId()));
         }
+
+        // 移除 variable 中 value 为 null 的 key
+        dto.getVariables().entrySet().removeIf(entry -> Objects.isNull(entry.getValue()));
+
         List<AttachmentDTO> tempAttachments = ListUtils.defaultIfNull(dto.getAttachmentList(), new ArrayList<>());
         if (StringUtils.hasText(dto.getSignatureUrl())) {
             AttachmentDTO signature = new AttachmentDTO();
@@ -138,6 +143,10 @@ public class BpmnProcessTaskController extends BasicPopulateAvatarController imp
         if (!StringUtils.hasText(dto.getTaskId())) {
             dto.setTaskId(bpmnProcessTaskService.findTaskIdByInstanceIdAndPersonId(dto.getProcessInstanceId(), dto.getApprover().getPersonId()));
         }
+
+        // 移除 variable 中 value 为 null 的 key
+        dto.getVariables().entrySet().removeIf(entry -> Objects.isNull(entry.getValue()));
+
         List<AttachmentDTO> tempAttachments = ListUtils.defaultIfNull(dto.getAttachmentList(), new ArrayList<>());
         if (StringUtils.hasText(dto.getSignatureUrl())) {
             AttachmentDTO signature = new AttachmentDTO();