Index: firmware/App/Controllers/BloodFlow.c
===================================================================
diff -u -rda838b2d59d8b12a239cd31f8b68b2b1bf78e4ae -rd4c8e0246e5bc34d1ef6a2e1709647716c84a378
--- firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision da838b2d59d8b12a239cd31f8b68b2b1bf78e4ae)
+++ firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision d4c8e0246e5bc34d1ef6a2e1709647716c84a378)
@@ -1004,7 +1004,7 @@
         U16 last = bpLastMotorHallSensorCounts[ bpMotorSpeedCalcIdx ];
         U32 nextIdx = INC_WRAP( bpMotorSpeedCalcIdx, 0, BP_SPEED_CALC_BUFFER_LEN - 1 );
         U16 incDelta = u16DiffWithWrap( bpLastMotorHallSensorCounts[ nextIdx ], bpMotorHallSensorCount );
-        U16 decDelta = HEX_64_K - incDelta;
+        U16 decDelta = ( 0 == incDelta ? 0xFFFF : HEX_64_K - incDelta );
         U16 spdDelta;
         S16 delta;