Signed-off-by: Michael Sartain <mikes...@fastmail.com>
---
 trace-output.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/trace-output.c b/trace-output.c
index bfe6331..84b21b0 100644
--- a/trace-output.c
+++ b/trace-output.c
@@ -929,7 +929,11 @@ tracecmd_add_option(struct tracecmd_output *handle,
                free(option);
                return NULL;
        }
-       memcpy(option->data, data, size);
+
+       /* Some IDs (like TRACECMD_OPTION_TRACECLOCK) pass NULL data */
+       if (data)
+               memcpy(option->data, data, size);
+
        list_add_tail(&option->list, &handle->options);
 
        return option;
-- 
2.13.2

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