Index: firmware/App/Modes/ModeFill.c
===================================================================
diff -u -r56ba1b163b0cbf6953638065b2108f745b17ec8f -r5e87586e6b8b8ee95c27b4ff69764992466114a9
--- firmware/App/Modes/ModeFill.c	(.../ModeFill.c)	(revision 56ba1b163b0cbf6953638065b2108f745b17ec8f)
+++ firmware/App/Modes/ModeFill.c	(.../ModeFill.c)	(revision 5e87586e6b8b8ee95c27b4ff69764992466114a9)
@@ -540,9 +540,9 @@
 
     if ( TRUE == didTimeout( flushBubblesStartTime, FLUSH_BUBBLES_PUMP_TIME_OUT_MS ) )
     {
-        if ( pumpSpeedIndex < RO_PUMP_LOOKUP_TABLE_SIZE )
+        if ( pumpSpeedIndex < RO_PUMP_LOOKUP_TABLE_SIZE - 1 )
         {
-            setROPumpTargetFlowRateLPM( RO_PUMP_FLUSH_BUBBLES_FLOWS[ pumpSpeedIndex++ ] / MILLILITERS_PER_LITER, TARGET_RO_PRESSURE_PSI );
+            setROPumpTargetFlowRateLPM( RO_PUMP_FLUSH_BUBBLES_FLOWS[ ++pumpSpeedIndex ] / MILLILITERS_PER_LITER, TARGET_RO_PRESSURE_PSI );
             flushBubblesStartTime = getMSTimerCount();
         }
         else