1 files changed, 1 insertions, 1 deletions
diff --git a/thread.c b/thread.c
index d9fe5506bc..342d4fe22a 100644
--- a/thread.c
+++ b/thread.c
@@ -4804,7 +4804,7 @@ update_coverage(rb_event_flag_t event, VALUE proc, VALUE self, ID id, VALUE klas
 	long line = rb_sourceline() - 1;
 	long count;
 	if (RARRAY_PTR(coverage)[line] == Qnil) {
-	    rb_bug("bug");
+	    return;
 	}
 	count = FIX2LONG(RARRAY_PTR(coverage)[line]) + 1;
 	if (POSFIXABLE(count)) {