diff --git a/src/main/drivers/pwm_output_stm32f3xx.c b/src/main/drivers/pwm_output_stm32f3xx.c
index a6d1501be8..0de0c2eda9 100644
--- a/src/main/drivers/pwm_output_stm32f3xx.c
+++ b/src/main/drivers/pwm_output_stm32f3xx.c
@@ -184,6 +184,11 @@ void pwmDigitalMotorHardwareConfig(const timerHardware_t *timerHardware, uint8_t
 
     DMA_Channel_TypeDef *channel = timerHardware->dmaChannel;
 
+    if (channel == NULL) {
+        /* trying to use a non valid channel */
+        return;
+    }
+
     dmaInit(timerHardware->dmaIrqHandler, OWNER_MOTOR, RESOURCE_INDEX(motorIndex));
     dmaSetHandler(timerHardware->dmaIrqHandler, motor_DMA_IRQHandler, NVIC_BUILD_PRIORITY(1, 2), motorIndex);
 
diff --git a/src/main/drivers/pwm_output_stm32f4xx.c b/src/main/drivers/pwm_output_stm32f4xx.c
index 48782f1b6b..8a391112ea 100644
--- a/src/main/drivers/pwm_output_stm32f4xx.c
+++ b/src/main/drivers/pwm_output_stm32f4xx.c
@@ -182,6 +182,11 @@ void pwmDigitalMotorHardwareConfig(const timerHardware_t *timerHardware, uint8_t
 
     DMA_Stream_TypeDef *stream = timerHardware->dmaStream;
 
+    if (stream == NULL) {
+        /* trying to use a non valid stream */
+        return;
+    }
+
     dmaInit(timerHardware->dmaIrqHandler, OWNER_MOTOR, RESOURCE_INDEX(motorIndex));
     dmaSetHandler(timerHardware->dmaIrqHandler, motor_DMA_IRQHandler, NVIC_BUILD_PRIORITY(1, 2), motorIndex);