The devAlias check is performed in the "if (!devAlias && !devid) {", so the situation is not handled when devAlias is NULL, and devid is not NULL Signed-off-by: Sergey Mironov <mironov(a)fintech.ru&gt; --- src/qemu/qemu_monitor_json.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index 5b9edadcf7..80b41d77d3 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -933,6 +933,11 @@ qemuMonitorJSONHandleTrayChange(qemuMonitor *mon, bool trayOpened; int reason; + if (!devAlias) { + VIR_WARN("missing device in tray change event"); + return; + } + /* drive alias is always reported but empty for -blockdev */ if (*devAlias == '\0') devAlias = NULL; -- 2.31.1