Index: firmware/App/Controllers/DGInterface.c
===================================================================
diff -u -r7499a42cc0f906f9a4a947c82c5b4615217ce7e5 -r659213fb2b743bc1593eae457d1895a21495a840
--- firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision 7499a42cc0f906f9a4a947c82c5b4615217ce7e5)
+++ firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision 659213fb2b743bc1593eae457d1895a21495a840)
@@ -14,6 +14,8 @@
 * @date    (original)  08-Apr-2020
 *
 ***************************************************************************/
+
+#include <math.h> // To check for NaN
 
 #include "DialInFlow.h"
 #include "Dialysis.h"
@@ -482,6 +484,12 @@
  *************************************************************************/
 void setDialysateFlowData( F32 flowRate )
 {
+    // Check if the sent value by DG is a NaN
+    if ( isnan( flowRate ) )
+    {
+        flowRate = 0.0;
+    }
+
     dgDialysateFlowRateMlMin = flowRate;
     dgDialysateFlowDataFreshFlag = TRUE;
 }