diff --git a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/utils/WorkflowUtils.java b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/utils/WorkflowUtils.java
index c9e7f5120..6650d0f81 100644
--- a/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/utils/WorkflowUtils.java
+++ b/ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/utils/WorkflowUtils.java
@@ -155,7 +155,14 @@ public class WorkflowUtils {
                 }
             } else {
                 List<HistoricIdentityLink> candidateList = StreamUtils.filter(linksForTask, e -> FlowConstant.CANDIDATE.equals(e.getType()));
-                List<Long> userIdList = StreamUtils.toList(linksForTask, e -> Long.valueOf(e.getUserId()));
+                List<Long> userIdList = new ArrayList<>();
+                for (HistoricIdentityLink historicIdentityLink : linksForTask) {
+                    try {
+                        userIdList.add(Long.valueOf(historicIdentityLink.getUserId()));
+                    } catch (NumberFormatException ignored) {
+
+                    }
+                }
                 List<SysUserVo> sysUsers = WORKFLOW_USER_SERVICE.getUserListByIds(userIdList);
                 if (CollUtil.isNotEmpty(sysUsers)) {
                     List<Long> userIds = StreamUtils.toList(sysUsers, SysUserVo::getUserId);