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-rw-r--r--vm_trace.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/vm_trace.c b/vm_trace.c
index 3a88811286..49a5fd0832 100644
--- a/vm_trace.c
+++ b/vm_trace.c
@@ -392,6 +392,7 @@ rb_suppress_tracing(VALUE (*func)(VALUE), VALUE arg)
int state;
const int tracing = th->trace_arg ? 1 : 0;
rb_trace_arg_t dummy_trace_arg;
+ dummy_trace_arg.event = 0;
if (!tracing) th->vm->trace_running++;
if (!th->trace_arg) th->trace_arg = &dummy_trace_arg;