diff --git a/firmware/robot.py b/firmware/robot.py
index 48f8741..e723e08 100644
--- a/firmware/robot.py
+++ b/firmware/robot.py
@@ -42,8 +42,12 @@ class Robot:
         str = str.lower().encode()
         try:
             self.serial_port.write(str)
-        except serial.serialutil.SerialTimeoutException:
-            pass
+        except AttributeError:
+            logger.error("ERROR: serial port not writeable.")
+        except serial.SerialException as e:
+            logger.error(e)
+        except serial.SerialTimeoutException as e:
+            logger.debug(e)
 
     def isMoving(self):
         return self.angle != self.target
@@ -94,5 +98,5 @@ class Robot:
         except NameError:
             logger.error("ERROR: configuration hasn't been set!")
             raise
-        except serial.serialutil.SerialException:
+        except serial.SerialException:
             logger.error("ERROR: Unable to start serial port.")