diff --git a/libraries/AP_HAL_ChibiOS/Scheduler.cpp b/libraries/AP_HAL_ChibiOS/Scheduler.cpp
index 90d7007482..66c811847e 100644
--- a/libraries/AP_HAL_ChibiOS/Scheduler.cpp
+++ b/libraries/AP_HAL_ChibiOS/Scheduler.cpp
@@ -352,17 +352,19 @@ void Scheduler::_monitor_thread(void *arg)
             // the main loop has been stuck for at least
             // 200ms. Starting logging the main loop state
             const AP_HAL::Util::PersistentData &pd = hal.util->persistent_data;
-            AP::logger().Write("MON", "TimeUS,LDelay,Task,IErr,IErrCnt,MavMsg,MavCmd,SemLine,SPICnt,I2CCnt", "QIbIIHHHII",
-                               AP_HAL::micros64(),
-                               loop_delay,
-                               pd.scheduler_task,
-                               pd.internal_errors,
-                               pd.internal_error_count,
-                               pd.last_mavlink_msgid,
-                               pd.last_mavlink_cmd,
-                               pd.semaphore_line,
-                               pd.spi_count,
-                               pd.i2c_count);
+            if (AP_Logger::get_singleton()) {
+                AP::logger().Write("MON", "TimeUS,LDelay,Task,IErr,IErrCnt,MavMsg,MavCmd,SemLine,SPICnt,I2CCnt", "QIbIIHHHII",
+                                   AP_HAL::micros64(),
+                                   loop_delay,
+                                   pd.scheduler_task,
+                                   pd.internal_errors,
+                                   pd.internal_error_count,
+                                   pd.last_mavlink_msgid,
+                                   pd.last_mavlink_cmd,
+                                   pd.semaphore_line,
+                                   pd.spi_count,
+                                   pd.i2c_count);
+                }
         }
         if (loop_delay >= 500) {
             // at 500ms we declare an internal error