diff --git a/src/current_sense/hardware_specific/stm32/stm32f1/stm32f1_mcu.cpp b/src/current_sense/hardware_specific/stm32/stm32f1/stm32f1_mcu.cpp
index 327c5305..49f2f3d5 100644
--- a/src/current_sense/hardware_specific/stm32/stm32f1/stm32f1_mcu.cpp
+++ b/src/current_sense/hardware_specific/stm32/stm32f1/stm32f1_mcu.cpp
@@ -53,7 +53,7 @@ void* _driverSyncLowSide(void* _driver_params, void* _cs_params){
   Stm32CurrentSenseParams* cs_params = (Stm32CurrentSenseParams*)_cs_params;
  
   // if compatible timer has not been found
-  if (cs_params->timer_handle == NULL) return;
+  if (cs_params->timer_handle == NULL) return SIMPLEFOC_CURRENT_SENSE_INIT_FAILED;
 
   // stop all the timers for the driver
   _stopTimers(driver_params->timers, 6);