diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index a3bdab048617..13ee5666668d 100644
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -46,5 +46,5 @@ void show_stack(struct task_struct *task, unsigned long *stack,
 	}
 
 	printk("%sCall Trace:\n", loglvl);
-	dump_trace(current, &stackops, (void *)loglvl);
+	dump_trace(task ?: current, &stackops, (void *)loglvl);
 }