diff --git a/common/tool_cmd.py b/common/tool_cmd.py
index c7d8f21db9f43b6ef3c2c02353c155e7b6d25d62..75dcc58a9936852977a6c46b12181948be9500a0 100644
--- a/common/tool_cmd.py
+++ b/common/tool_cmd.py
@@ -88,6 +88,8 @@ class ToolCmd:
                 perf_args = {}
             if args.offcpu:
                 offcpu_args = {'offcpu_enable': args.offcpu, 'offcpu_pid':args.offcpu_pid, 'offcpu_duration':args.offcpu_duration}
+            else:
+                offcpu_args = {}
         else:
             perf_args = {}
             offcpu_args = {}